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 A297796 #6 May 03 2020 15:37:29 %S A297796 1,2,37,422,23781,5511367,3420197908,4611250894511,18829563773811206 %N A297796 Number of n X n 0..1 arrays with every 1 horizontally, diagonally or antidiagonally adjacent to 2, 3 or 5 neighboring 1's. %C A297796 Diagonal of A297802. %e A297796 Some solutions for n=5 %e A297796 ..0..1..1..1..0. .0..1..1..1..1. .1..1..0..0..0. .0..0..1..0..0 %e A297796 ..1..0..0..1..1. .1..0..0..1..0. .1..1..0..1..1. .1..1..0..1..0 %e A297796 ..0..1..0..0..1. .0..1..0..0..0. .1..1..0..1..1. .0..1..0..0..1 %e A297796 ..0..1..1..1..0. .1..1..1..1..1. .0..1..0..0..1. .1..1..1..1..0 %e A297796 ..0..0..1..0..0. .0..1..0..1..0. .0..0..1..1..0. .1..1..0..1..1 %Y A297796 Cf. A297802. %K A297796 nonn %O A297796 1,2 %A A297796 _R. H. Hardin_, Jan 06 2018