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.
%I A295777 #4 Nov 27 2017 07:11:23 %S A295777 8,49,198,1059,5263,25529,127731,630988,3118368,15452696,76444609, %T A295777 378316752,1872559828,9266918261,45863407707,226985095214, %U A295777 1123365612319,5559672436516,27515436853783,136176807358073,673954171761877 %N A295777 Number of nX4 0..1 arrays with each 1 adjacent to 0 or 2 king-move neighboring 1s. %C A295777 Column 4 of A295781. %H A295777 R. H. Hardin, <a href="/A295777/b295777.txt">Table of n, a(n) for n = 1..210</a> %F A295777 Empirical: a(n) = 4*a(n-1) +6*a(n-2) +6*a(n-3) -58*a(n-4) -20*a(n-5) +29*a(n-6) -92*a(n-7) +7*a(n-8) +2*a(n-9) -2*a(n-10) %e A295777 Some solutions for n=7 %e A295777 ..0..0..0..0. .0..0..0..1. .0..0..1..1. .0..0..1..0. .0..0..0..1 %e A295777 ..0..1..0..0. .0..0..0..0. .1..0..1..0. .1..0..0..0. .1..1..0..0 %e A295777 ..1..1..0..0. .1..0..0..0. .0..0..0..0. .0..0..1..0. .0..1..0..1 %e A295777 ..0..0..0..0. .0..0..0..1. .0..0..0..1. .0..1..1..0. .0..0..0..0 %e A295777 ..0..0..0..1. .0..1..0..0. .0..0..0..0. .0..0..0..0. .0..0..1..0 %e A295777 ..1..1..0..0. .0..0..0..0. .1..1..0..1. .0..1..0..0. .0..0..0..0 %e A295777 ..1..0..0..0. .1..0..0..0. .0..1..0..0. .1..1..0..1. .1..0..1..0 %Y A295777 Cf. A295781. %K A295777 nonn %O A295777 1,1 %A A295777 _R. H. Hardin_, Nov 27 2017