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 A297576 #6 May 03 2020 15:32:52 %S A297576 1,5,36,254,5800,395011,38609160,5752782514,2136636243308, %T A297576 1857722960742588,2730521146982947356,7180017772945965801201 %N A297576 Number of n X n 0..1 arrays with every 1 horizontally, diagonally or antidiagonally adjacent to 1 or 4 neighboring 1's. %C A297576 Diagonal of A297582. %e A297576 Some solutions for n=5 %e A297576 ..0..0..0..1..0. .0..1..0..0..1. .0..1..1..0..0. .0..0..1..0..0 %e A297576 ..0..1..0..0..1. .1..0..0..1..0. .0..0..0..0..0. .0..0..0..1..0 %e A297576 ..1..0..0..0..0. .0..0..0..1..0. .1..0..0..0..0. .1..1..0..0..0 %e A297576 ..1..0..0..0..0. .0..0..0..0..1. .1..1..1..0..0. .0..0..0..1..0 %e A297576 ..0..1..0..0..0. .1..1..0..0..0. .1..0..0..0..0. .1..1..0..0..1 %Y A297576 Cf. A297582. %K A297576 nonn %O A297576 1,2 %A A297576 _R. H. Hardin_, Jan 01 2018