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 A303463 #6 Sep 16 2020 19:05:28 %S A303463 1,8,170,9110,1243692,427097893,373571747330,831176090437185, %T A303463 4696687907289825363 %N A303463 Number of n X n 0..1 arrays with every element equal to 0, 1, 2, 3, 5 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero. %C A303463 Diagonal of A303469. %e A303463 Some solutions for n=5 %e A303463 ..0..0..0..0..0. .0..0..0..0..0. .0..0..0..0..1. .0..0..0..0..0 %e A303463 ..1..1..0..1..1. .0..1..1..0..1. .0..0..1..1..1. .1..0..1..1..0 %e A303463 ..0..1..0..1..1. .0..1..0..0..1. .1..0..1..1..1. .0..0..1..1..0 %e A303463 ..1..1..0..1..1. .0..0..0..1..1. .1..0..0..0..1. .1..0..0..1..0 %e A303463 ..0..1..0..1..0. .0..1..0..0..0. .0..0..1..0..0. .1..0..1..1..1 %Y A303463 Cf. A303469. %K A303463 nonn %O A303463 1,2 %A A303463 _R. H. Hardin_, Apr 24 2018