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 12 results. Next

A297308 Number of n X n 0..1 arrays with every 1 horizontally or antidiagonally adjacent to 1 or 2 neighboring 1's.

Original entry on oeis.org

1, 7, 117, 3808, 484808, 200646607, 197589351469, 578079526400673, 5377924483062338484, 139752957415982420114129, 10302206214700301342887034910, 2267938084956284272782357464419480
Offset: 1

Views

Author

R. H. Hardin, Dec 28 2017

Keywords

Comments

Diagonal of A297314.

Examples

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

Crossrefs

Cf. A297314.

A297309 Number of n X 3 0..1 arrays with every 1 horizontally or antidiagonally adjacent to 1 or 2 neighboring 1s.

Original entry on oeis.org

4, 23, 117, 609, 3159, 16389, 85041, 441225, 2289339, 11878281, 61631001, 319774761, 1659164103, 8608637997, 44666257401, 231752633913, 1202457662523, 6238998904833, 32371291359585, 167959719216009, 871465613342823
Offset: 1

Views

Author

R. H. Hardin, Dec 28 2017

Keywords

Examples

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

Crossrefs

Column 3 of A297314.

Formula

Empirical: a(n) = 3*a(n-1) + 11*a(n-2) + 3*a(n-3) - 6*a(n-4).
Empirical g.f.: x*(4 + 11*x + 4*x^2 - 7*x^3) / (1 - 3*x - 11*x^2 - 3*x^3 + 6*x^4). - Colin Barker, Feb 26 2019

A297310 Number of n X 4 0..1 arrays with every 1 horizontally or antidiagonally adjacent to 1 or 2 neighboring 1s.

Original entry on oeis.org

7, 66, 497, 3808, 29212, 223995, 1717882, 13174266, 101033369, 774822892, 5942100272, 45569854023, 349474289622, 2680111429330, 20553721242845, 157626080234992, 1208831279237072, 9270503076704855, 71095304015354510
Offset: 1

Views

Author

R. H. Hardin, Dec 28 2017

Keywords

Examples

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

Crossrefs

Column 4 of A297314.

Formula

Empirical: a(n) = 4*a(n-1) + 26*a(n-2) + 22*a(n-3) - 43*a(n-4) - a(n-5) + 7*a(n-6) - a(n-7) - a(n-8) for n>9.
Empirical g.f.: x*(7 + 38*x + 51*x^2 - 50*x^3 - 93*x^4 + 50*x^5 + 2*x^6 - 10*x^7 + x^8) / ((1 - 7*x - 5*x^2 - x^3)*(1 + 3*x - 6*x^3 + 4*x^4 - x^5)). - Colin Barker, Feb 26 2019

A297311 Number of nX5 0..1 arrays with every 1 horizontally or antidiagonally adjacent to 1 or 2 neighboring 1s.

Original entry on oeis.org

12, 207, 2577, 35476, 484808, 6623719, 90535227, 1237278512, 16909630099, 231098841942, 3158359335337, 43164380571143, 589914903106589, 8062194454707849, 110183650123040906, 1505847685192695964
Offset: 1

Views

Author

R. H. Hardin, Dec 28 2017

Keywords

Comments

Column 5 of A297314.

Examples

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

Crossrefs

Cf. A297314.

Formula

Empirical: a(n) = 6*a(n-1) +91*a(n-2) +215*a(n-3) -317*a(n-4) -733*a(n-5) +1104*a(n-6) -40*a(n-7) -1643*a(n-8) +1667*a(n-9) -589*a(n-10) +69*a(n-11) -a(n-12) for n>14

A297312 Number of nX6 0..1 arrays with every 1 horizontally or antidiagonally adjacent to 1 or 2 neighboring 1s.

Original entry on oeis.org

21, 654, 13937, 340825, 8273245, 200646607, 4869858862, 118156684121, 2867120332406, 69570025944705, 1688108287602302, 40961748924233513, 993931518658886393, 24117625902266425892, 585211158099440381626
Offset: 1

Views

Author

R. H. Hardin, Dec 28 2017

Keywords

Comments

Column 6 of A297314.

Examples

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

Crossrefs

Cf. A297314.

Formula

Empirical: a(n) = 9*a(n-1) +324*a(n-2) +1428*a(n-3) -6254*a(n-4) -30323*a(n-5) +97813*a(n-6) +136166*a(n-7) -925019*a(n-8) +1597152*a(n-9) -1178936*a(n-10) +88497*a(n-11) +390484*a(n-12) -218599*a(n-13) +44101*a(n-14) -18308*a(n-15) -28030*a(n-16) +15541*a(n-17) +1362*a(n-18) -1947*a(n-19) +200*a(n-20) +84*a(n-21) -16*a(n-22) for n>25

A297313 Number of nX7 0..1 arrays with every 1 horizontally or antidiagonally adjacent to 1 or 2 neighboring 1s.

Original entry on oeis.org

37, 2049, 72541, 2997197, 121339476, 4893232934, 197589351469, 7976248015498, 322003901582689, 12999267991486894, 524779765336699929, 21185341677783382911, 855251189043741854090, 34526455187798967298229
Offset: 1

Views

Author

R. H. Hardin, Dec 28 2017

Keywords

Comments

Column 7 of A297314.

Examples

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

Crossrefs

Cf. A297314.

Formula

Empirical: a(n) = 13*a(n-1) +964*a(n-2) +7855*a(n-3) -73030*a(n-4) -695613*a(n-5) +4192801*a(n-6) +21033448*a(n-7) -189025018*a(n-8) +184530457*a(n-9) +2066786840*a(n-10) -6682871967*a(n-11) -2708665119*a(n-12) +45304491886*a(n-13) -54509700621*a(n-14) -95719215815*a(n-15) +223090781321*a(n-16) +84502966487*a(n-17) -410238492043*a(n-18) -12548934436*a(n-19) +443801529456*a(n-20) -51099076433*a(n-21) -300831504736*a(n-22) +77062707971*a(n-23) +143343109349*a(n-24) -51338858358*a(n-25) -50336809366*a(n-26) +15557513886*a(n-27) +10486046289*a(n-28) -2094967974*a(n-29) -921214165*a(n-30) +89836481*a(n-31) +14593572*a(n-32) +487976*a(n-33) -95199*a(n-34) -3510*a(n-35) for n>39

A297315 Number of 2 X n 0..1 arrays with every 1 horizontally or antidiagonally adjacent to 1 or 2 neighboring 1s.

Original entry on oeis.org

1, 7, 23, 66, 207, 654, 2049, 6422, 20119, 63033, 197551, 619096, 1940007, 6079365, 19051015, 59700283, 187082905, 586262278, 1837172149, 5757153010, 18041210871, 56535805498, 177166451873, 555187134041, 1739791875173, 5451991915452
Offset: 1

Views

Author

R. H. Hardin, Dec 28 2017

Keywords

Examples

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

Crossrefs

Row 2 of A297314.

Formula

Empirical: a(n) = 3*a(n-1) - 2*a(n-2) + 8*a(n-3) - 3*a(n-4) + 7*a(n-5) - 5*a(n-6) - a(n-7) - a(n-8) + a(n-9).
Empirical g.f.: x*(1 + x - x^2)*(1 + 3*x + 2*x^2 + 4*x^3 - x^5 - x^6) / ((1 - x + 2*x^2 - x^3)*(1 - 2*x - 2*x^2 - 5*x^3 + x^5 + x^6)). - Colin Barker, Feb 26 2019

A297316 Number of 3Xn 0..1 arrays with every 1 horizontally or antidiagonally adjacent to 1 or 2 neighboring 1s.

Original entry on oeis.org

1, 21, 117, 497, 2577, 13937, 72541, 375054, 1951949, 10170792, 52930039, 275412159, 1433386475, 7460147264, 38825258091, 202060807970, 1051605128451, 5472968149750, 28483454530439, 148239012444720, 771493812884305
Offset: 1

Views

Author

R. H. Hardin, Dec 28 2017

Keywords

Comments

Row 3 of A297314.

Examples

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

Crossrefs

Cf. A297314.

Formula

Empirical: a(n) = 5*a(n-1) -7*a(n-2) +42*a(n-3) -20*a(n-4) +120*a(n-5) -109*a(n-6) +179*a(n-7) -371*a(n-8) +53*a(n-9) +390*a(n-10) -408*a(n-11) +204*a(n-12) -101*a(n-13) -43*a(n-14) +151*a(n-15) -139*a(n-16) +61*a(n-17) +2*a(n-18) -21*a(n-19) +15*a(n-20) -2*a(n-21) -a(n-22) +a(n-23)

A297317 Number of 4Xn 0..1 arrays with every 1 horizontally or antidiagonally adjacent to 1 or 2 neighboring 1s.

Original entry on oeis.org

1, 65, 609, 3808, 35476, 340825, 2997197, 26513027, 237701708, 2127406714, 19008671433, 169867295652, 1518292533694, 13571135299252, 121300487637606, 1084181857884980, 9690470338269840, 86614217136138558, 774163716085023913
Offset: 1

Views

Author

R. H. Hardin, Dec 28 2017

Keywords

Comments

Row 4 of A297314.

Examples

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

Crossrefs

Cf. A297314.

Formula

Empirical: a(n) = 8*a(n-1) -19*a(n-2) +241*a(n-3) -214*a(n-4) +2642*a(n-5) -4441*a(n-6) +10173*a(n-7) -44273*a(n-8) +27691*a(n-9) -123086*a(n-10) +338644*a(n-11) +977891*a(n-12) -2407823*a(n-13) -1722701*a(n-14) +5420139*a(n-15) +181351*a(n-16) -530670*a(n-17) -5094160*a(n-18) -11451388*a(n-19) +23975138*a(n-20) +13834285*a(n-21) -45414081*a(n-22) +22470502*a(n-23) -4685760*a(n-24) -10494413*a(n-25) +68713200*a(n-26) -90955823*a(n-27) +1979872*a(n-28) +123075762*a(n-29) -166311052*a(n-30) +114905974*a(n-31) -28056285*a(n-32) -23893428*a(n-33) +23876735*a(n-34) -10891063*a(n-35) -4771775*a(n-36) +5539152*a(n-37) +1564374*a(n-38) -2623482*a(n-39) +3267984*a(n-40) -1046749*a(n-41) +32122*a(n-42) +232950*a(n-43) -239978*a(n-44) +59114*a(n-45) +11836*a(n-46) -17936*a(n-47) -14104*a(n-48) +7504*a(n-49) -7357*a(n-50) +5254*a(n-51) +506*a(n-52) -959*a(n-53) +335*a(n-54) -181*a(n-55) +67*a(n-56) +25*a(n-57) -2*a(n-58) -6*a(n-59) -2*a(n-60) +a(n-61)

A297318 Number of 5Xn 0..1 arrays with every 1 horizontally or antidiagonally adjacent to 1 or 2 neighboring 1s.

Original entry on oeis.org

1, 200, 3159, 29212, 484808, 8273245, 121339476, 1815438259, 27950049482, 426949482189, 6494779570376, 98961790075322, 1508712969034695, 22994788538451691, 350445360895775177, 5341072484013959839
Offset: 1

Views

Author

R. H. Hardin, Dec 28 2017

Keywords

Comments

Row 5 of A297314.

Examples

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

Crossrefs

Cf. A297314.
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