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

A297218 Number of n X n 0..1 arrays with every 1 horizontally or antidiagonally adjacent to 1 neighboring 1's.

Original entry on oeis.org

1, 4, 24, 207, 5570, 261939, 20599895, 3819208252, 1400212345305, 937962844219314, 1312275096984570369, 3708386833907642906568, 20177474743877943669370721, 220442917573207336661039688056
Offset: 1

Views

Author

R. H. Hardin, Dec 27 2017

Keywords

Comments

Diagonal of A297224.

Examples

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

Crossrefs

Cf. A297224.

A297219 Number of n X 3 0..1 arrays with every 1 horizontally or antidiagonally adjacent to 1 neighboring 1s.

Original entry on oeis.org

3, 8, 24, 68, 196, 564, 1620, 4660, 13396, 38516, 110740, 318388, 915412, 2631924, 7567124, 21756468, 62552660, 179847028, 517083540, 1486682292, 4274404564, 12289467892, 35333815316, 101589305140, 292082437972, 839774919796
Offset: 1

Views

Author

R. H. Hardin, Dec 27 2017

Keywords

Examples

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

Crossrefs

Column 3 of A297224.

Formula

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

A297220 Number of n X 4 0..1 arrays with every 1 horizontally or antidiagonally adjacent to 1 neighboring 1s.

Original entry on oeis.org

4, 16, 57, 207, 751, 2720, 9861, 35741, 129540, 469528, 1701805, 6168220, 22356839, 81032722, 293704534, 1064537220, 3858433620, 13984959985, 50688731051, 183722188635, 665904273716, 2413581640617, 8748068704189, 31707527421628
Offset: 1

Views

Author

R. H. Hardin, Dec 27 2017

Keywords

Examples

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

Crossrefs

Column 4 of A297224.

Formula

Empirical: a(n) = a(n-1) + 6*a(n-2) + 11*a(n-3) + 6*a(n-4) + a(n-5).
Empirical g.f.: x*(2 + x)^2*(1 + 2*x + 2*x^2) / (1 - x - 6*x^2 - 11*x^3 - 6*x^4 - x^5). - Colin Barker, Feb 26 2019

A297221 Number of n X 5 0..1 arrays with every 1 horizontally or antidiagonally adjacent to 1 neighboring 1s.

Original entry on oeis.org

6, 33, 182, 997, 5570, 30946, 171851, 955316, 5308160, 29497088, 163916530, 910869797, 5061672943, 28127490455, 156303166524, 868569845751, 4826603668246, 26821221189069, 149044329620412, 828232684722634
Offset: 1

Views

Author

R. H. Hardin, Dec 27 2017

Keywords

Examples

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

Crossrefs

Column 5 of A297224.

Formula

Empirical: a(n) = a(n-1) + 16*a(n-2) + 45*a(n-3) + 39*a(n-4) - 3*a(n-5) - 21*a(n-6) + 8*a(n-7) - 4*a(n-8) + a(n-9).
Empirical g.f.: x*(6 + 27*x + 53*x^2 + 17*x^3 - 58*x^4 - 35*x^5 + 47*x^6 - 13*x^7 + x^8) / ((1 + 2*x + x^2 - x^3)*(1 - 3*x - 11*x^2 - 19*x^3 + 7*x^4 - 3*x^5 + x^6)). - Colin Barker, Feb 26 2019

A297222 Number of nX6 0..1 arrays with every 1 horizontally or antidiagonally adjacent to 1 neighboring 1s.

Original entry on oeis.org

9, 69, 535, 4210, 33158, 261939, 2063378, 16277793, 128351805, 1012130530, 7981569963, 62939687472, 496326792470, 3913894569563, 30863877179841, 243384068190066, 1919259204181410, 15134747411461711, 119348431276698530
Offset: 1

Views

Author

R. H. Hardin, Dec 27 2017

Keywords

Comments

Column 6 of A297224.

Examples

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

Crossrefs

Cf. A297224.

Formula

Empirical: a(n) = a(n-1) +34*a(n-2) +146*a(n-3) +141*a(n-4) -184*a(n-5) -461*a(n-6) +413*a(n-7) -498*a(n-8) -119*a(n-9) +408*a(n-10) +144*a(n-11) for n>13

A297223 Number of nX7 0..1 arrays with every 1 horizontally or antidiagonally adjacent to 1 neighboring 1s.

Original entry on oeis.org

13, 145, 1513, 16658, 178469, 1918732, 20599895, 221333623, 2377449633, 25538644681, 274338521973, 2946944060015, 31656188524253, 340051734132151, 3652845905487029, 39238984432264619, 421506370243881833
Offset: 1

Views

Author

R. H. Hardin, Dec 27 2017

Keywords

Comments

Column 7 of A297224.

Examples

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

Crossrefs

Cf. A297224.

Formula

Empirical: a(n) = a(n-1) +60*a(n-2) +410*a(n-3) +804*a(n-4) -206*a(n-5) -4210*a(n-6) -136*a(n-7) -4099*a(n-8) -6059*a(n-9) +20146*a(n-10) +14506*a(n-11) -16052*a(n-12) +4656*a(n-13) -228*a(n-14) -100*a(n-15) +12*a(n-16) for n>21

A297225 Number of 3Xn 0..1 arrays with every 1 horizontally or antidiagonally adjacent to 1 neighboring 1s.

Original entry on oeis.org

1, 9, 24, 57, 182, 535, 1513, 4415, 12832, 37110, 107661, 312229, 904915, 2623749, 7607302, 22054261, 63940404, 185379485, 537454173, 1558199157, 4517574360, 13097454856, 37972451701, 110090662857, 319177485549, 925367027389
Offset: 1

Views

Author

R. H. Hardin, Dec 27 2017

Keywords

Comments

Row 3 of A297224.

Examples

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

Crossrefs

Cf. A297224.

Formula

Empirical: a(n) = a(n-1) +2*a(n-2) +8*a(n-3) +6*a(n-4) +4*a(n-5) -6*a(n-6) -8*a(n-7) -8*a(n-8) +10*a(n-9) +4*a(n-10) -2*a(n-11) -3*a(n-12) +a(n-13)

A297226 Number of 4Xn 0..1 arrays with every 1 horizontally or antidiagonally adjacent to 1 neighboring 1s.

Original entry on oeis.org

1, 19, 68, 207, 997, 4210, 16658, 68769, 284867, 1170146, 4807394, 19787328, 81424284, 334903296, 1377738399, 5668140481, 23317788357, 95926011656, 394630220291, 1623463820564, 6678736090662, 27475550500449, 113031264492453
Offset: 1

Views

Author

R. H. Hardin, Dec 27 2017

Keywords

Comments

Row 4 of A297224.

Examples

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

Crossrefs

Cf. A297224.

Formula

Empirical: a(n) = 4*a(n-2) +29*a(n-3) +66*a(n-4) +121*a(n-5) +83*a(n-6) -a(n-7) -205*a(n-8) -224*a(n-9) +30*a(n-10) +473*a(n-11) -96*a(n-12) -289*a(n-13) -109*a(n-14) -3*a(n-15) +126*a(n-16) +160*a(n-17) -150*a(n-18) -112*a(n-19) +43*a(n-20) +124*a(n-21) -53*a(n-22) +3*a(n-23) -25*a(n-24) +6*a(n-25) -a(n-26) +a(n-27)

A297227 Number of 5Xn 0..1 arrays with every 1 horizontally or antidiagonally adjacent to 1 neighboring 1s.

Original entry on oeis.org

1, 41, 196, 751, 5570, 33158, 178469, 1051514, 6152761, 35360059, 204610794, 1185387515, 6858428469, 39687403360, 229672443463, 1329125857816, 7691795163442, 44512304299166, 257592990212772, 1490702456602803
Offset: 1

Views

Author

R. H. Hardin, Dec 27 2017

Keywords

Comments

Row 5 of A297224.

Examples

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

Crossrefs

Cf. A297224.

Formula

Empirical: a(n) = a(n-1) +8*a(n-2) +78*a(n-3) +174*a(n-4) +351*a(n-5) -416*a(n-6) -1842*a(n-7) -5441*a(n-8) +761*a(n-9) +9986*a(n-10) +44032*a(n-11) +6608*a(n-12) -112959*a(n-13) -240830*a(n-14) +407117*a(n-15) +340423*a(n-16) -339453*a(n-17) -827799*a(n-18) +470840*a(n-19) +1069281*a(n-20) -477291*a(n-21) -686619*a(n-22) -696576*a(n-23) +1489660*a(n-24) +278216*a(n-25) -482103*a(n-26) -1864399*a(n-27) +2863215*a(n-28) -270635*a(n-29) -3293055*a(n-30) +3268056*a(n-31) -1576074*a(n-32) +3879227*a(n-33) -8061662*a(n-34) +9295255*a(n-35) -8324335*a(n-36) +8467289*a(n-37) -8065138*a(n-38) +4976344*a(n-39) -3584983*a(n-40) +3053749*a(n-41) -1432366*a(n-42) +1039335*a(n-43) -821799*a(n-44) +317432*a(n-45) -251304*a(n-46) +174088*a(n-47) -64693*a(n-48) +49419*a(n-49) -24207*a(n-50) +4719*a(n-51) -6975*a(n-52) +1108*a(n-53) -478*a(n-54) +629*a(n-55) +13*a(n-56) +70*a(n-57) -9*a(n-58) +a(n-59) -a(n-60)

A297228 Number of 6Xn 0..1 arrays with every 1 horizontally or antidiagonally adjacent to 1 neighboring 1s.

Original entry on oeis.org

1, 88, 564, 2720, 30946, 261939, 1918732, 16176806, 134671502, 1084005062, 8855022968, 72556284402, 592076260322, 4833986775520, 39491897603294, 322560160507073, 2634426639664265, 21517102473205131, 175744528043164291
Offset: 1

Views

Author

R. H. Hardin, Dec 27 2017

Keywords

Comments

Row 6 of A297224.

Examples

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

Crossrefs

Cf. A297224.
Showing 1-10 of 11 results. Next