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 A286976 #6 Apr 05 2020 23:29:49 %S A286976 0,126,3932,123706,3584756,108110791,3229944132,98063836816, %T A286976 2979455186170,91160980841335,2796112154318134,86095874180805420, %U A286976 2657384402642912532,82232542990639333587,2549783287899756993727 %N A286976 Number of n X 5 0..1 arrays with the number of 1's horizontally or vertically adjacent to some 0 two less than the number of 0's adjacent to some 1. %C A286976 Column 5 of A286979. %H A286976 R. H. Hardin, <a href="/A286976/b286976.txt">Table of n, a(n) for n = 1..78</a> %e A286976 Some solutions for n=4 %e A286976 ..0..0..1..0..0. .0..0..1..0..1. .0..0..0..1..0. .0..0..1..0..0 %e A286976 ..1..0..0..1..1. .1..0..0..1..0. .1..0..0..0..1. .1..0..0..1..0 %e A286976 ..1..1..0..1..1. .0..0..1..1..0. .0..1..1..0..0. .1..0..1..0..1 %e A286976 ..0..1..0..0..0. .1..0..1..1..0. .0..0..1..1..1. .1..1..0..0..1 %Y A286976 Cf. A286979. %K A286976 nonn %O A286976 1,2 %A A286976 _R. H. Hardin_, May 17 2017