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 A297714 #6 May 03 2020 15:35:57 %S A297714 1,10,145,4212,512354,183324631,154327332017,362685079640486, %T A297714 2553300741336194602 %N A297714 Number of n X n 0..1 arrays with every 1 horizontally, diagonally or antidiagonally adjacent to 1, 2 or 4 neighboring 1's. %C A297714 Diagonal of A297720. %e A297714 Some solutions for n=4 %e A297714 ..1..0..0..0. .0..0..0..0. .1..0..1..1. .0..0..1..1. .0..1..0..0 %e A297714 ..0..1..0..0. .0..0..0..0. .1..1..0..0. .0..0..1..0. .1..1..0..0 %e A297714 ..0..0..1..0. .1..1..0..0. .0..0..1..0. .0..0..0..0. .1..0..0..1 %e A297714 ..0..1..1..0. .0..0..1..0. .0..0..1..1. .0..1..1..0. .0..0..1..1 %Y A297714 Cf. A297720. %K A297714 nonn %O A297714 1,2 %A A297714 _R. H. Hardin_, Jan 04 2018