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 1-5 of 5 results.

A296124 Number of n X 4 0..1 arrays with each 1 adjacent to 2 or 5 king-move neighboring 1s.

Original entry on oeis.org

1, 13, 30, 74, 287, 841, 2463, 7953, 24428, 74660, 233017, 721069, 2226921, 6907921, 21399342, 66252970, 205308499, 636102161, 1970540971, 6105562057, 18917255184, 58610713832, 181598709121, 562663895105, 1743342282089, 5401567886229
Offset: 1

Views

Author

R. H. Hardin, Dec 05 2017

Keywords

Examples

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

Crossrefs

Column 4 of A296128.

Formula

Empirical: a(n) = 3*a(n-1) + a(n-2) + 5*a(n-3) - 18*a(n-4) - 14*a(n-5) + 3*a(n-6) + a(n-7) + a(n-8) - a(n-9).
Empirical g.f.: x*(1 + x)*(1 + 9*x - 19*x^2 - 15*x^3 + 3*x^4 + x^5 + x^6 - x^7) / (1 - 3*x - x^2 - 5*x^3 + 18*x^4 + 14*x^5 - 3*x^6 - x^7 - x^8 + x^9). - Colin Barker, Feb 22 2019

A296125 Number of nX5 0..1 arrays with each 1 adjacent to 2 or 5 king-move neighboring 1s.

Original entry on oeis.org

1, 33, 107, 287, 2098, 9344, 35733, 182881, 859151, 3752449, 17718898, 83133830, 379861714, 1768819146, 8263436507, 38298070989, 178230046892, 831322027550, 3869744621937, 18028069104813, 84070919008122, 391898815331194
Offset: 1

Views

Author

R. H. Hardin, Dec 05 2017

Keywords

Comments

Column 5 of A296128.

Examples

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

Crossrefs

Cf. A296128.

Formula

Empirical: a(n) = 7*a(n-1) -10*a(n-2) +50*a(n-3) -343*a(n-4) +344*a(n-5) -618*a(n-6) +6047*a(n-7) -5744*a(n-8) +4077*a(n-9) -57564*a(n-10) +55295*a(n-11) -21106*a(n-12) +335248*a(n-13) -318626*a(n-14) +84293*a(n-15) -1236170*a(n-16) +1106930*a(n-17) -187162*a(n-18) +2867721*a(n-19) -2269772*a(n-20) +74097*a(n-21) -4021798*a(n-22) +2511232*a(n-23) +527543*a(n-24) +3090935*a(n-25) -1014833*a(n-26) -1021724*a(n-27) -995912*a(n-28) -447310*a(n-29) +634272*a(n-30) +10000*a(n-31) +371548*a(n-32) -67104*a(n-33) +3168*a(n-34) +12608*a(n-35) -3840*a(n-36) -8560*a(n-37) +128*a(n-38) +256*a(n-39)

A296126 Number of nX6 0..1 arrays with each 1 adjacent to 2 or 5 king-move neighboring 1s.

Original entry on oeis.org

1, 69, 265, 841, 9344, 54286, 263489, 1867837, 11720327, 67180741, 427478196, 2684604782, 16293846922, 101493385902, 633831772689, 3915691482795, 24329648655368, 151531436485578, 940950081557125, 5849298968131709
Offset: 1

Views

Author

R. H. Hardin, Dec 05 2017

Keywords

Comments

Column 6 of A296128.

Examples

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

Crossrefs

Cf. A296128.

A296127 Number of nX7 0..1 arrays with each 1 adjacent to 2 or 5 king-move neighboring 1s.

Original entry on oeis.org

1, 121, 553, 2463, 35733, 263489, 1810441, 16855693, 138016847, 1087543621, 9228070694, 76704166206, 628908321069, 5245176224753, 43644001864720, 361707709471024, 3008980635521615, 25033019588307299, 208047564104356544
Offset: 1

Views

Author

R. H. Hardin, Dec 05 2017

Keywords

Comments

Column 7 of A296128.

Examples

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

Crossrefs

Cf. A296128.

A296123 Number of n X n 0..1 arrays with each 1 adjacent to 2 or 5 king-move neighboring 1's.

Original entry on oeis.org

1, 5, 18, 74, 2098, 54286, 1810441, 227074899, 41069612676, 11999602459480, 8460640112181759, 10489963059013433653
Offset: 1

Views

Author

R. H. Hardin, Dec 05 2017

Keywords

Comments

Diagonal of A296128.

Examples

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

Crossrefs

Cf. A296128.
Showing 1-5 of 5 results.