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 A295524 #6 Apr 26 2020 20:50:51 %S A295524 1,10,147,7071,1012315,437241277,563330031268,2154370064869978, %T A295524 24591601562099287015,837044464889796587986014, %U A295524 84914857903369744218835564258 %N A295524 Number of n X n 0..1 arrays with each 1 horizontally or vertically adjacent to 1, 2 or 4 1's. %C A295524 Diagonal of A295531. %e A295524 Some solutions for n=5 %e A295524 ..1..0..1..0..0. .0..0..1..0..0. .0..0..1..0..0. .0..0..0..0..0 %e A295524 ..1..1..1..1..0. .0..0..1..0..0. .0..0..1..0..1. .0..0..0..0..0 %e A295524 ..0..0..1..0..1. .1..0..1..0..1. .1..0..0..1..1. .0..1..1..0..1 %e A295524 ..1..0..0..0..1. .1..0..0..1..1. .1..0..1..0..0. .1..1..0..1..1 %e A295524 ..1..0..1..1..1. .0..0..0..1..0. .0..0..1..0..0. .0..0..0..1..0 %Y A295524 Cf. A295531. %K A295524 nonn %O A295524 1,2 %A A295524 _R. H. Hardin_, Nov 23 2017