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 A302306 #4 Apr 05 2018 09:36:21 %S A302306 8,31,48,194,445,1271,3915,12420,42897,158170,605532,2395817,9709409, %T A302306 39880121,165585758,693033415,2914777618,12305134022,52090542883, %U A302306 220906709231,938079788895,3987432050368,16960357014483,72175348991290 %N A302306 Number of nX5 0..1 arrays with every element equal to 0, 1, 3 or 4 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero. %C A302306 Column 5 of A302309. %H A302306 R. H. Hardin, <a href="/A302306/b302306.txt">Table of n, a(n) for n = 1..210</a> %e A302306 Some solutions for n=5 %e A302306 ..0..1..0..1..0. .0..1..1..0..1. .0..1..0..0..1. .0..0..1..0..1 %e A302306 ..0..1..0..1..0. .1..0..1..0..0. .0..1..0..1..0. .0..1..0..0..1 %e A302306 ..1..1..0..0..0. .1..0..1..0..1. .0..1..0..1..0. .0..1..0..0..0 %e A302306 ..1..1..1..1..1. .0..0..1..0..1. .1..1..0..1..0. .0..1..1..0..1 %e A302306 ..0..1..1..0..1. .1..0..1..0..1. .0..1..0..0..0. .0..1..0..1..1 %Y A302306 Cf. A302309. %K A302306 nonn %O A302306 1,1 %A A302306 _R. H. Hardin_, Apr 05 2018