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 A302361 #6 Sep 16 2020 18:54:49 %S A302361 1,2,31,77,6580,330505,188443738,169314399506,675015247638492 %N A302361 Number of n X n 0..1 arrays with every element equal to 0, 2, 3 or 4 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero. %C A302361 Diagonal of A302367. %e A302361 Some solutions for n=5 %e A302361 ..0..1..1..0..0. .0..1..1..0..0. .0..0..0..0..0. .0..0..1..1..0 %e A302361 ..1..1..0..0..1. .0..1..1..0..0. .1..0..1..0..0. .0..0..1..1..1 %e A302361 ..0..1..0..0..0. .1..1..1..0..1. .0..0..1..0..1. .0..0..1..1..0 %e A302361 ..1..1..1..0..1. .0..1..1..0..0. .0..0..1..0..0. .1..0..0..1..1 %e A302361 ..1..1..1..0..1. .1..1..0..0..1. .1..0..0..0..0. .0..0..1..1..0 %Y A302361 Cf. A302367. %K A302361 nonn %O A302361 1,2 %A A302361 _R. H. Hardin_, Apr 06 2018