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 A297676 #6 May 03 2020 15:35:13 %S A297676 2,11,150,4633,401678,78957968,41030621948,49892385650107, %T A297676 157266548152111938,1187668466030040777022,22731639382952184172610914, %U A297676 1058867886808501107531538859306 %N A297676 Number of n X n 0..1 arrays with every 1 horizontally, diagonally or antidiagonally adjacent to 0, 1 or 4 neighboring 1's. %C A297676 Diagonal of A297682. %e A297676 Some solutions for n=4 %e A297676 ..1..0..0..0. .0..0..0..0. .1..0..0..0. .0..1..0..1. .0..0..0..1 %e A297676 ..1..0..0..1. .0..0..0..0. .0..0..0..0. .0..1..0..1. .0..1..0..0 %e A297676 ..1..0..0..0. .0..0..0..1. .1..0..0..1. .0..0..0..0. .0..0..1..1 %e A297676 ..0..0..1..0. .0..0..0..0. .1..0..0..0. .0..0..1..0. .0..1..0..1 %Y A297676 Cf. A297682. %K A297676 nonn %O A297676 1,1 %A A297676 _R. H. Hardin_, Jan 03 2018