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 A289648 #6 Apr 05 2020 23:33:46 %S A289648 0,170,3160,121162,2662095,98170524,2439241607,85298181531, %T A289648 2290353406298,77037980321836,2176569413456699,71346369797861453, %U A289648 2085490311029971908,67240283396530142367,2011139437400224916141,64177327039938639669846 %N A289648 Number of n X 5 0..1 arrays with the number of 1's horizontally, antidiagonally or vertically adjacent to some 0 two less than the number of 0's adjacent to some 1. %C A289648 Column 5 of A289651. %H A289648 R. H. Hardin, <a href="/A289648/b289648.txt">Table of n, a(n) for n = 1..100</a> %e A289648 Some solutions for n=4 %e A289648 ..0..1..0..0..0. .0..0..1..1..1. .0..0..1..0..0. .0..1..1..0..1 %e A289648 ..1..1..1..0..0. .1..0..1..0..1. .1..1..1..0..0. .0..0..1..1..0 %e A289648 ..0..0..1..1..0. .0..0..0..0..1. .0..1..1..0..0. .1..1..0..0..0 %e A289648 ..0..1..1..0..0. .1..1..0..0..0. .0..0..0..1..1. .1..0..0..1..0 %Y A289648 Cf. A289651. %K A289648 nonn %O A289648 1,2 %A A289648 _R. H. Hardin_, Jul 09 2017