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 A303096 #6 Sep 16 2020 19:02:37 %S A303096 0,3,77,4667,1138331,906385523,2441756629583,22050004579190301, %T A303096 670548945799312331099 %N A303096 Number of n X n 0..1 arrays with every element equal to 1, 2, 3, 4 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero. %C A303096 Diagonal of A303102. %e A303096 Some solutions for n=5 %e A303096 ..0..0..0..0..0. .0..0..0..0..0. .0..0..0..0..0. .0..0..0..0..0 %e A303096 ..0..1..0..1..1. .0..0..0..0..1. .1..0..1..0..0. .0..1..1..1..1 %e A303096 ..0..1..1..0..0. .1..1..1..1..0. .0..1..1..1..0. .0..1..1..1..0 %e A303096 ..1..0..1..0..1. .0..0..1..0..1. .0..1..1..1..0. .0..0..1..0..0 %e A303096 ..0..1..1..1..0. .1..1..1..1..1. .0..0..1..0..0. .0..1..1..0..0 %Y A303096 Cf. A303102. %K A303096 nonn %O A303096 1,2 %A A303096 _R. H. Hardin_, Apr 18 2018