cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

Showing 1-10 of 11 results. Next

A297590 Number of n X 3 0..1 arrays with every 1 horizontally, diagonally or antidiagonally adjacent to 1 or 5 neighboring 1s.

Original entry on oeis.org

1, 3, 9, 25, 69, 205, 597, 1701, 4949, 14389, 41493, 120149, 348437, 1008021, 2917653, 8451605, 24467733, 70830869, 205101333, 593841429, 1719269653, 4977934613, 14412904725, 41729378581, 120820070677, 349814724885, 1012822636821, 2932443592981, 8490378131733
Offset: 0

Views

Author

R. H. Hardin, Jan 01 2018

Keywords

Examples

			Some solutions for n=7:
..0..0..0. .0..1..1. .0..0..0. .0..1..0. .0..0..0. .0..0..0. .0..0..1
..1..0..0. .0..0..0. .0..1..1. .1..0..0. .0..0..0. .0..1..1. .0..1..0
..0..1..0. .1..0..0. .0..0..0. .0..0..0. .0..1..1. .0..0..0. .0..1..0
..0..0..0. .0..1..0. .0..1..1. .1..1..0. .0..0..0. .0..0..1. .0..0..1
..1..0..1. .0..0..0. .0..0..0. .0..0..0. .1..0..0. .0..1..0. .0..0..1
..1..1..1. .0..1..0. .1..1..0. .0..0..0. .0..1..0. .0..0..0. .0..1..0
..1..0..0. .1..0..0. .0..0..0. .0..0..0. .0..0..0. .0..1..1. .0..0..0
		

Crossrefs

Column 3 of A297595.

Formula

Empirical: a(n) = a(n-1) + 2*a(n-2) + 10*a(n-3) + 4*a(n-4) - 8*a(n-5) - 8*a(n-6).
Empirical g.f.: 1 + x*(3 + 6*x + 10*x^2 - 4*x^3 - 16*x^4 - 8*x^5) / ((1 - x)*(1 - 2*x^2 - 12*x^3 - 16*x^4 - 8*x^5)). - Colin Barker, Mar 01 2019

Extensions

a(0)=1 prepended by Alois P. Heinz, Mar 01 2019

A297591 Number of n X 4 0..1 arrays with every 1 horizontally, diagonally or antidiagonally adjacent to 1 or 5 neighboring 1s.

Original entry on oeis.org

1, 4, 13, 49, 154, 577, 1977, 6962, 24441, 85803, 300758, 1056231, 3705161, 13002296, 45626359, 160104845, 561810578, 1971441799, 6917860901, 24275155066, 85182802525, 298910850927, 1048893665520, 3680622917741, 12915496721997, 45321151308320, 159034280809195
Offset: 0

Views

Author

R. H. Hardin, Jan 01 2018

Keywords

Examples

			Some solutions for n=7:
  0 0 0 0   0 0 0 0   0 0 1 0   0 0 0 0   0 0 0 1
  0 1 0 0   0 1 0 1   0 1 0 0   0 1 1 0   0 0 1 0
  0 0 1 0   0 1 1 1   0 1 0 0   0 0 0 0   0 0 1 0
  0 0 0 0   0 0 0 1   1 0 0 0   0 0 0 0   0 1 0 0
  0 0 0 0   0 0 0 0   1 0 1 0   0 0 1 0   0 1 0 0
  0 0 1 1   0 0 0 1   0 1 1 0   1 1 1 0   1 0 0 1
  0 0 0 0   0 0 1 0   1 0 1 0   1 0 1 0   0 0 1 0
		

Crossrefs

Column 4 of A297595.

Formula

Empirical: a(n) = a(n-1) + 6*a(n-2) + 10*a(n-3) + 3*a(n-4) - 13*a(n-5) + 3*a(n-6) - 3*a(n-7) - 4*a(n-8) - a(n-9).
Empirical g.f.: 1 + x*(4 + 9*x + 12*x^2 - 13*x^3 - 13*x^4 - x^5 - 7*x^6 - 5*x^7 - x^8) / (1 - x - 6*x^2 - 10*x^3 - 3*x^4 + 13*x^5 - 3*x^6 + 3*x^7 + 4*x^8 + x^9). - Colin Barker, Mar 01 2019

Extensions

a(0)=1 prepended by Alois P. Heinz, Mar 01 2019

A297592 Number of nX5 0..1 arrays with every 1 horizontally, diagonally or antidiagonally adjacent to 1 or 5 neighboring 1s.

Original entry on oeis.org

6, 33, 145, 752, 3747, 18577, 93150, 464697, 2320289, 11591504, 57880641, 289072233, 1443683308, 7209863009, 36007227773, 179824937844, 898069917949, 4485086714025, 22399136063860, 111864365243177, 558666033595587
Offset: 1

Views

Author

R. H. Hardin, Jan 01 2018

Keywords

Comments

Column 5 of A297595.

Examples

			Some solutions for n=7
..0..0..0..0..1. .0..0..0..1..0. .0..0..0..0..0. .0..1..0..0..0
..0..1..0..1..0. .0..0..1..0..0. .0..0..1..1..0. .1..0..0..1..0
..1..0..0..0..0. .0..0..1..0..0. .0..0..0..0..0. .0..0..1..0..0
..0..0..0..1..1. .0..0..0..1..0. .1..1..0..1..1. .1..0..0..0..0
..0..1..0..0..0. .0..1..0..1..0. .0..0..0..0..0. .0..1..0..1..1
..1..0..0..1..0. .0..1..1..0..0. .0..0..0..0..1. .0..0..0..0..0
..0..0..0..0..1. .0..1..0..1..0. .1..1..0..1..0. .0..0..0..0..0
		

Crossrefs

Cf. A297595.

Formula

Empirical: a(n) = a(n-1) +8*a(n-2) +45*a(n-3) +77*a(n-4) +50*a(n-5) -236*a(n-6) -474*a(n-7) -291*a(n-8) -115*a(n-9) -109*a(n-10) +780*a(n-11) +984*a(n-12) +1210*a(n-13) -80*a(n-14) +684*a(n-15) +136*a(n-16) -594*a(n-17) -247*a(n-18) -179*a(n-19) -97*a(n-20) -32*a(n-21) +16*a(n-22)

A297593 Number of nX6 0..1 arrays with every 1 horizontally, diagonally or antidiagonally adjacent to 1 or 5 neighboring 1s.

Original entry on oeis.org

9, 69, 443, 3145, 23066, 163704, 1172288, 8419996, 60354437, 432486880, 3101191209, 22233839619, 159387906784, 1142689244796, 8192204302737, 58730805975407, 421050083127329, 3018577722454520, 21640640428753082
Offset: 1

Views

Author

R. H. Hardin, Jan 01 2018

Keywords

Comments

Column 6 of A297595.

Examples

			Some solutions for n=6
..0..0..0..0..0..1. .0..0..0..1..1..0. .0..0..0..0..1..1. .0..0..0..0..1..0
..0..0..0..0..1..0. .0..0..0..0..0..0. .0..0..0..0..0..0. .0..0..0..1..0..0
..0..1..0..0..0..0. .1..0..0..0..0..0. .0..0..0..0..1..1. .1..0..0..0..0..0
..0..0..1..0..1..1. .1..1..1..0..0..0. .0..0..0..0..0..0. .0..1..0..1..0..1
..0..0..0..0..0..0. .1..0..1..0..1..0. .0..0..1..0..0..0. .0..0..0..0..1..1
..0..0..0..0..0..0. .0..0..0..0..0..1. .0..1..0..0..1..1. .0..0..0..1..0..1
		

Crossrefs

Cf. A297595.

Formula

Empirical: a(n) = 2*a(n-1) +16*a(n-2) +129*a(n-3) +227*a(n-4) -105*a(n-5) -2226*a(n-6) -4884*a(n-7) +604*a(n-8) +23119*a(n-9) +49143*a(n-10) -53762*a(n-11) -181270*a(n-12) -193040*a(n-13) +219246*a(n-14) +1003859*a(n-15) +263263*a(n-16) -1820114*a(n-17) +2250789*a(n-18) -5172086*a(n-19) +6760023*a(n-20) -7333665*a(n-21) +5453092*a(n-22) -7795474*a(n-23) +8828869*a(n-24) -3949092*a(n-25) +5296459*a(n-26) -3251790*a(n-27) -454888*a(n-28) +122955*a(n-29) +274302*a(n-30) +88776*a(n-31) -155166*a(n-32) -139911*a(n-33) -80887*a(n-34) +76672*a(n-35) -9221*a(n-36) +8982*a(n-37) -4846*a(n-38) -987*a(n-39) +396*a(n-40)

A297594 Number of nX7 0..1 arrays with every 1 horizontally, diagonally or antidiagonally adjacent to 1 or 5 neighboring 1s.

Original entry on oeis.org

13, 121, 1141, 10131, 103673, 975485, 9403199, 90862063, 875241087, 8427042917, 81250292031, 782990517405, 7544924295103, 72709571496955, 700713916141533, 6752623088862903, 65073651435105965, 627109480901081661
Offset: 1

Views

Author

R. H. Hardin, Jan 01 2018

Keywords

Comments

Column 7 of A297595.

Examples

			Some solutions for n=5
..0..1..1..0..0..1..1. .0..1..1..0..0..0..0. .0..0..0..0..0..0..0
..0..0..0..0..0..0..0. .0..0..0..0..0..1..1. .0..0..0..0..1..1..0
..1..1..0..0..0..0..1. .0..0..0..0..0..0..0. .0..0..0..0..0..0..0
..0..0..0..0..1..1..1. .0..0..1..1..0..1..0. .0..0..0..0..0..1..1
..1..1..0..0..1..0..1. .0..0..0..0..0..0..1. .1..1..0..0..0..0..0
		

Crossrefs

Cf. A297595.

Formula

Empirical recurrence of order 83 (see link above)

A297596 Number of 3 X n 0..1 arrays with every 1 horizontally, diagonally or antidiagonally adjacent to 1 or 5 neighboring 1s.

Original entry on oeis.org

1, 9, 25, 49, 145, 443, 1141, 3009, 8455, 23151, 62211, 169651, 464469, 1262947, 3434407, 9364725, 25517397, 69467533, 189209921, 515479315, 1403998341, 3823905513, 10415880295, 28371283095, 77275911315, 210482481315
Offset: 1

Views

Author

R. H. Hardin, Jan 01 2018

Keywords

Examples

			Some solutions for n=7:
..1..0..0..1..1..0..0. .0..0..0..1..1..0..0. .1..0..1..0..0..0..0
..0..1..0..0..0..0..0. .0..1..0..0..0..0..0. .1..1..1..0..0..1..0
..0..0..0..0..0..0..0. .1..0..0..0..0..1..1. .1..0..0..0..0..0..1
		

Crossrefs

Row 3 of A297595.

Formula

Empirical: a(n) = a(n-1) + a(n-2) + 8*a(n-3) + 7*a(n-4) - 8*a(n-6) - 6*a(n-7).
Empirical g.f.: x*(1 + 8*x + 15*x^2 + 7*x^3 - 8*x^4 - 14*x^5 - 6*x^6) / (1 - x - x^2 - 8*x^3 - 7*x^4 + 8*x^6 + 6*x^7). - Colin Barker, Mar 01 2019

A297597 Number of 4Xn 0..1 arrays with every 1 horizontally, diagonally or antidiagonally adjacent to 1 or 5 neighboring 1s.

Original entry on oeis.org

1, 20, 69, 154, 752, 3145, 10131, 37929, 150388, 546267, 2000770, 7586016, 28281649, 104554687, 390572927, 1458526512, 5423019339, 20199712660, 75329388620, 280578366045, 1045017557629, 3894288535989, 14509490578040, 54051253212923
Offset: 1

Views

Author

R. H. Hardin, Jan 01 2018

Keywords

Comments

Row 4 of A297595.

Examples

			Some solutions for n=7
..0..0..0..1..0..0..0. .0..0..0..0..1..1..0. .1..0..0..0..1..0..1
..0..0..0..0..1..0..0. .0..0..0..0..0..0..0. .0..1..0..0..1..1..1
..0..0..0..0..0..0..1. .0..1..0..0..1..1..0. .0..0..0..0..0..0..1
..0..1..1..0..0..1..0. .1..0..0..0..0..0..0. .0..1..1..0..0..0..0
		

Crossrefs

Cf. A297595.

Formula

Empirical: a(n) = a(n-1) +3*a(n-2) +24*a(n-3) +23*a(n-4) -17*a(n-5) -95*a(n-6) -73*a(n-7) -45*a(n-8) -36*a(n-9) +4*a(n-10) -4*a(n-11) +2*a(n-12)

A297598 Number of 5Xn 0..1 arrays with every 1 horizontally, diagonally or antidiagonally adjacent to 1 or 5 neighboring 1s.

Original entry on oeis.org

1, 41, 205, 577, 3747, 23066, 103673, 514290, 2834897, 14505899, 72679629, 377711106, 1958960586, 10014143622, 51449828843, 265527351855, 1365723938126, 7018444981802, 36127198341369, 185940488937815, 956389182435753
Offset: 1

Views

Author

R. H. Hardin, Jan 01 2018

Keywords

Comments

Row 5 of A297595.

Examples

			Some solutions for n=7
..0..1..0..0..0..0..0. .0..1..0..0..0..0..0. .0..0..1..0..0..0..0
..0..0..1..0..0..0..0. .1..0..0..0..1..1..0. .0..1..0..0..0..0..0
..0..0..0..0..1..1..0. .1..0..1..0..0..0..0. .0..1..0..1..0..0..0
..1..0..0..0..0..0..0. .1..1..1..0..1..1..0. .0..0..1..1..0..0..0
..0..1..0..0..1..1..0. .1..0..0..0..0..0..0. .0..1..0..1..0..1..1
		

Crossrefs

Cf. A297595.

Formula

Empirical: a(n) = a(n-1) +4*a(n-2) +69*a(n-3) +140*a(n-4) +75*a(n-5) -819*a(n-6) -2333*a(n-7) -3025*a(n-8) +2643*a(n-9) +10976*a(n-10) +11484*a(n-11) +8292*a(n-12) -9866*a(n-13) -21676*a(n-14) -50620*a(n-15) -23742*a(n-16) +4580*a(n-17) +75360*a(n-18) +31530*a(n-19) +13258*a(n-20) -56614*a(n-21) -22102*a(n-22) -18586*a(n-23) +348*a(n-24) -4914*a(n-25) -882*a(n-26)

A297599 Number of 6Xn 0..1 arrays with every 1 horizontally, diagonally or antidiagonally adjacent to 1 or 5 neighboring 1s.

Original entry on oeis.org

1, 85, 597, 1977, 18577, 163704, 975485, 6551844, 50398161, 352390358, 2398926979, 17125942248, 121877564552, 851145373245, 5985375126147, 42335812708116, 298062036716448, 2096304373306315, 14776780052329473, 104136065922562829
Offset: 1

Views

Author

R. H. Hardin, Jan 01 2018

Keywords

Comments

Row 6 of A297595.

Examples

			Some solutions for n=6
..0..0..0..0..0..0. .0..0..0..0..1..0. .0..1..1..0..0..0. .0..0..0..1..0..1
..0..0..0..1..0..1. .1..1..0..0..0..1. .0..0..0..0..1..1. .0..0..0..1..1..1
..1..1..0..1..1..1. .0..0..0..0..0..0. .1..1..0..0..0..0. .0..1..0..0..0..1
..0..0..0..0..0..1. .1..0..1..0..0..0. .0..0..0..0..0..0. .0..0..1..0..0..1
..0..0..0..0..0..0. .1..1..1..0..1..1. .1..1..0..1..0..0. .0..0..0..0..1..0
..1..1..0..1..1..0. .1..0..0..0..0..0. .0..0..0..0..1..0. .1..1..0..0..0..0
		

Crossrefs

Cf. A297595.

Formula

Empirical: a(n) = a(n-1) +12*a(n-2) +206*a(n-3) +513*a(n-4) -732*a(n-5) -12596*a(n-6) -41052*a(n-7) -4710*a(n-8) +377637*a(n-9) +1101532*a(n-10) +366692*a(n-11) -4343819*a(n-12) -12490935*a(n-13) -9276248*a(n-14) +15909019*a(n-15) +71212770*a(n-16) +61679513*a(n-17) +21749848*a(n-18) -140969781*a(n-19) -237463915*a(n-20) -163497345*a(n-21) -435237443*a(n-22) +473778443*a(n-23) +950680659*a(n-24) +3170197500*a(n-25) +3748925010*a(n-26) +2206798374*a(n-27) -317152120*a(n-28) -4875492868*a(n-29) -5969143264*a(n-30) -534214988*a(n-31) +2304486028*a(n-32) +2576130508*a(n-33) -2467773439*a(n-34) +650799326*a(n-35) -1914397174*a(n-36) +953402425*a(n-37) +521148604*a(n-38) +357576020*a(n-39) -85114712*a(n-40) -158612761*a(n-41) -10014570*a(n-42) +14399616*a(n-43) +3440613*a(n-44) +176856*a(n-45) -189896*a(n-46) -768*a(n-47) -77056*a(n-48) +7168*a(n-49)

A297600 Number of 7Xn 0..1 arrays with every 1 horizontally, diagonally or antidiagonally adjacent to 1 or 5 neighboring 1s.

Original entry on oeis.org

1, 178, 1701, 6962, 93150, 1172288, 9403199, 85828150, 919035936, 8853487049, 82411356392, 809231737581, 7936987592888, 76162052363914, 735775369925651, 7159378085264000, 69324523431873026, 670205953180878528
Offset: 1

Views

Author

R. H. Hardin, Jan 01 2018

Keywords

Comments

Row 7 of A297595.

Examples

			Some solutions for n=5
..0..0..0..0..0. .0..1..0..1..0. .0..0..1..0..1. .1..0..1..0..0
..1..1..0..1..1. .1..0..0..0..1. .0..0..1..1..0. .1..1..0..0..0
..0..0..0..0..0. .0..0..0..0..0. .0..0..1..0..1. .1..0..1..0..0
..1..1..0..1..1. .0..1..0..1..1. .1..0..0..0..0. .1..0..0..0..0
..0..0..0..0..0. .1..0..0..0..0. .0..1..0..0..0. .0..1..0..0..0
..0..0..0..0..0. .0..0..0..1..0. .0..0..0..0..0. .0..1..0..1..1
..0..0..0..0..0. .1..1..0..0..1. .1..1..0..1..1. .1..0..0..0..0
		

Crossrefs

Cf. A297595.
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