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 A302959 #6 Sep 16 2020 19:01:04 %S A302959 1,8,154,6206,493132,83644490,28906043997,20541759534725, %T A302959 30306087158412513 %N A302959 Number of n X n 0..1 arrays with every element equal to 0, 1, 2, 3 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero. %C A302959 Diagonal of A302965. %e A302959 Some solutions for n=5 %e A302959 ..0..0..0..1..1. .0..0..0..0..0. .0..0..0..1..0. .0..0..0..0..0 %e A302959 ..1..1..0..1..1. .0..1..1..1..0. .1..1..0..1..0. .1..1..1..1..0 %e A302959 ..0..1..0..1..0. .0..0..0..0..1. .0..1..0..1..1. .0..0..1..0..1 %e A302959 ..0..1..0..1..1. .1..1..1..0..0. .1..0..0..0..0. .0..0..0..1..0 %e A302959 ..1..0..0..1..0. .0..1..1..1..0. .1..1..1..0..1. .1..1..1..1..0 %Y A302959 Cf. A302965. %K A302959 nonn %O A302959 1,2 %A A302959 _R. H. Hardin_, Apr 16 2018