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 A302629 #6 Sep 16 2020 18:57:44 %S A302629 1,3,8,33,257,2262,30216,652931,18446157,797627174,48788464441, %T A302629 4420985966927,579498900792438,110425750437014304,30435339544089493297 %N A302629 Number of n X n 0..1 arrays with every element equal to 0, 1, 3 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero. %C A302629 Diagonal of A302635. %e A302629 Some solutions for n=5 %e A302629 ..0..1..0..1..0. .0..1..1..0..1. .0..1..0..1..0. .0..1..1..0..0 %e A302629 ..0..1..0..1..0. .1..0..1..0..0. .0..1..0..1..1. .0..1..0..1..0 %e A302629 ..1..1..0..1..0. .0..0..0..0..0. .1..1..0..1..0. .0..1..0..1..0 %e A302629 ..0..1..0..1..0. .0..0..1..0..1. .0..1..0..0..0. .0..1..0..1..0 %e A302629 ..0..1..0..1..0. .1..0..1..1..0. .0..1..0..1..0. .0..1..0..0..1 %Y A302629 Cf. A302635. %K A302629 nonn %O A302629 1,2 %A A302629 _R. H. Hardin_, Apr 10 2018