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 1-7 of 7 results.

A202789 Number of n X 2 binary arrays with every one adjacent to another one horizontally, diagonally, antidiagonally or vertically.

Original entry on oeis.org

2, 12, 50, 188, 724, 2820, 10960, 42544, 165176, 641376, 2490416, 9669968, 37547296, 145791744, 566092192, 2198069056, 8534842304, 33139784256, 128677866752, 499640952320, 1940046781312, 7532972421120, 29249641835776, 113572903188736
Offset: 1

Views

Author

R. H. Hardin, Dec 24 2011

Keywords

Comments

Column 2 of A202795.

Examples

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

Crossrefs

Cf. A202795.

Formula

Empirical: a(n) = 4*a(n-1) - 2*a(n-2) + 6*a(n-3).
Empirical g.f.: 2*x*(1 + 2*x + 3*x^2) / (1 - 4*x + 2*x^2 - 6*x^3). - Colin Barker, Mar 03 2018

A202788 Number of n X n binary arrays with every one adjacent to another one horizontally, diagonally, antidiagonally or vertically.

Original entry on oeis.org

1, 12, 398, 45519, 21649928, 41382940317, 314293683119573, 9507225584601580673, 1146261969825089219425266, 550762886957237938187269588944, 1054576957682838130471744629459577753
Offset: 1

Views

Author

R. H. Hardin, Dec 24 2011

Keywords

Comments

Diagonal of A202795.

Examples

			Some solutions for n=4
..1..1..1..1....0..0..1..1....0..1..1..0....0..1..1..1....0..1..0..0
..0..0..1..1....0..1..0..1....1..0..1..0....0..0..0..1....0..1..1..1
..0..1..1..1....0..0..0..0....1..1..1..0....1..0..0..1....1..1..0..1
..1..0..0..0....1..1..0..0....1..1..1..1....1..1..1..1....1..0..1..0
		

Crossrefs

Cf. A202795.

A202790 Number of n X 3 binary arrays with every one adjacent to another one horizontally, diagonally, antidiagonally or vertically.

Original entry on oeis.org

4, 50, 398, 3018, 23436, 182430, 1417772, 11017196, 85621362, 665418194, 5171353118, 40189602848, 312336995590, 2427354106352, 18864392868124, 146606264807250, 1139363300400646, 8854660691296250, 68814763405175276
Offset: 1

Views

Author

R. H. Hardin, Dec 24 2011

Keywords

Comments

Column 3 of A202795.

Examples

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

Crossrefs

Cf. A202795.

Formula

Empirical: a(n) = 7*a(n-1) +2*a(n-2) +29*a(n-3) +16*a(n-4).
Empirical g.f.: 2*x*(2 + 11*x + 20*x^2 + 8*x^3) / (1 - 7*x - 2*x^2 - 29*x^3 - 16*x^4). - Colin Barker, Jun 01 2018

A202791 Number of nX4 binary arrays with every one adjacent to another one horizontally, diagonally, antidiagonally or vertically.

Original entry on oeis.org

7, 188, 3018, 45519, 702846, 10892633, 168585867, 2608652667, 40368680378, 624709738658, 9667409438049, 149603458151594, 2315118684227671, 35826543150768395, 554417008884929693, 8579622591285149046
Offset: 1

Views

Author

R. H. Hardin Dec 24 2011

Keywords

Comments

Column 4 of A202795

Examples

			Some solutions for n=4
..1..1..0..0....1..1..0..0....1..0..1..1....0..1..1..0....1..1..1..0
..0..0..0..0....1..0..1..1....0..1..1..1....0..0..1..1....0..0..0..1
..0..0..1..0....1..1..0..1....0..0..0..1....1..0..1..1....0..0..1..0
..0..0..1..1....1..0..0..0....0..0..1..1....1..0..1..0....1..1..1..0
		

Formula

Empirical: a(n) = 15*a(n-1) -6*a(n-2) +199*a(n-3) +124*a(n-4) -102*a(n-5) +105*a(n-6) -282*a(n-7) -342*a(n-8) +162*a(n-9)

A202792 Number of nX5 binary arrays with every one adjacent to another one horizontally, diagonally, antidiagonally or vertically.

Original entry on oeis.org

12, 724, 23436, 702846, 21649928, 669872090, 20696263392, 639259508770, 19746821708510, 609991818060458, 18842950812606880, 582067589653914988, 17980345177885556288, 555421459716439841384, 17157234238650483438818
Offset: 1

Views

Author

R. H. Hardin Dec 24 2011

Keywords

Comments

Column 5 of A202795

Examples

			Some solutions for n=3
..1..1..1..0..0....0..1..1..1..0....0..0..0..0..1....0..0..1..0..1
..1..1..1..1..1....0..1..0..0..1....0..1..0..0..1....1..0..0..1..0
..1..1..0..1..1....0..0..0..1..1....1..1..1..0..0....1..0..0..0..1
		

Formula

Empirical: a(n) = 29*a(n-1) -5*a(n-2) +1820*a(n-3) +3756*a(n-4) +14798*a(n-5) +39177*a(n-6) -33008*a(n-7) -120144*a(n-8) -276809*a(n-9) -534984*a(n-10) +521787*a(n-11) +1495342*a(n-12) +136066*a(n-13) -826372*a(n-14) -258636*a(n-15) -55508*a(n-16) -65340*a(n-17) +26654*a(n-18) +9760*a(n-19) +1452*a(n-20) +3060*a(n-21)

A202793 Number of nX6 binary arrays with every one adjacent to another one horizontally, diagonally, antidiagonally or vertically.

Original entry on oeis.org

21, 2820, 182430, 10892633, 669872090, 41382940317, 2552520578945, 157398925950921, 9706685199080140, 598614098605286252, 36916537177815949777, 2276641091540314028026, 140400382336831018887599
Offset: 1

Views

Author

R. H. Hardin Dec 24 2011

Keywords

Comments

Column 6 of A202795

Examples

			Some solutions for n=2
..1..0..0..1..1..0....1..1..1..0..1..0....0..1..0..0..1..1....0..1..1..0..1..1
..0..1..0..0..1..0....0..0..0..0..1..0....0..1..0..0..0..0....0..0..1..0..1..0
		

Formula

Empirical: a(n) = 59*a(n-1) -96*a(n-2) +15198*a(n-3) +44555*a(n-4) +546802*a(n-5) +2654703*a(n-6) -11605935*a(n-7) -50148646*a(n-8) -109619761*a(n-9) -489848269*a(n-10) +2807188309*a(n-11) +13538187787*a(n-12) -14006226585*a(n-13) -84978170899*a(n-14) +5293728878*a(n-15) +168471311892*a(n-16) +81639123840*a(n-17) +53515556371*a(n-18) -81576024670*a(n-19) -376950186859*a(n-20) -165736793100*a(n-21) -12429982950*a(n-22) +165840234156*a(n-23) +312039809784*a(n-24) +124310784240*a(n-25) +34336444320*a(n-26) -46415278368*a(n-27) -79007876928*a(n-28) -33286629888*a(n-29) -11428107264*a(n-30)

A202794 Number of nX7 binary arrays with every one adjacent to another one horizontally, diagonally, antidiagonally or vertically.

Original entry on oeis.org

37, 10960, 1417772, 168585867, 20696263392, 2552520578945, 314293683119573, 38688895320766945, 4762933853090450802, 586367068773478325010, 72187597225974934381107, 8887000410940815491975644
Offset: 1

Views

Author

R. H. Hardin Dec 24 2011

Keywords

Comments

Column 7 of A202795

Examples

			Some solutions for n=2
..0..0..0..0..1..1..1....0..1..0..0..0..1..0....1..0..1..0..1..1..0
..1..1..1..0..0..1..0....1..1..0..0..0..1..0....1..1..1..1..0..1..0
		

Formula

Empirical: a(n) = 116*a(n-1) -296*a(n-2) +134529*a(n-3) +910448*a(n-4) +32002645*a(n-5) +303792182*a(n-6) -274352367*a(n-7) -4553032481*a(n-8) -255464462439*a(n-9) -2564370181498*a(n-10) +3644407163485*a(n-11) +79890586561000*a(n-12) +692867879459014*a(n-13) +5340037410632238*a(n-14) -27697667859465447*a(n-15) -350399052874916127*a(n-16) +220849398095860794*a(n-17) +7638409455780774294*a(n-18) +4866818035419949332*a(n-19) -72337785204533265225*a(n-20) -96987081597388772030*a(n-21) +182924266571367258073*a(n-22) +455507949722882174117*a(n-23) +1577927042339412020867*a(n-24) +1466816734937249906401*a(n-25) -9210879986368819971180*a(n-26) -14710061453528888004978*a(n-27) -10266615283727697297035*a(n-28) -5426733751946837588438*a(n-29) +128856230391754102340524*a(n-30) +190968829483790799607694*a(n-31) +18153867338155588036077*a(n-32) +35132143370512533053490*a(n-33) -814633095069822582376942*a(n-34) -1311231354512138456570860*a(n-35) -240281889644749772219856*a(n-36) -944241848508844773234577*a(n-37) +1984444138948153039215217*a(n-38) +3702125192328894859997033*a(n-39) +2150017385587368309459975*a(n-40) +6214820433967172033813092*a(n-41) +715295954577709319019156*a(n-42) +2377107132309172520279758*a(n-43) +355996505560192583614994*a(n-44) -1440267118184540161588288*a(n-45) +358634102872409242797644*a(n-46) -1316771241754607915926988*a(n-47) -21781176900509558851560*a(n-48) -157752158322616242657120*a(n-49) -176405863142160452197176*a(n-50) +118483196392227220082928*a(n-51) -68731346642077739519568*a(n-52) +31758624172313831595600*a(n-53) -3050873407387199742336*a(n-54) -1303075403234971813440*a(n-55) +1558199142139361630400*a(n-56) -627861169109993184000*a(n-57) -5309406999953308800*a(n-58) +42814277346859632000*a(n-59) -6919998916194720000*a(n-60) +330257844734400000*a(n-61)
Showing 1-7 of 7 results.