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 A299445 #6 Jun 15 2020 14:38:52 %S A299445 1,4,1,21,231,211,6326,174794,665961,84553473,4512663317 %N A299445 Number of n X n 0..1 arrays with every element equal to 0, 1, 3, 5, 6 or 8 king-move adjacent elements, with upper left element zero. %C A299445 Diagonal of A299451. %e A299445 Some solutions for n=5 %e A299445 ..0..0..0..1..1. .0..1..1..1..0. .0..1..1..1..0. .0..0..1..1..1 %e A299445 ..1..1..0..0..0. .0..1..1..1..0. .1..0..1..0..1. .0..0..1..1..1 %e A299445 ..0..0..0..0..0. .1..1..1..1..1. .1..1..1..1..1. .1..1..1..1..1 %e A299445 ..0..0..0..1..1. .1..0..1..0..1. .1..0..1..1..0. .1..1..1..0..0 %e A299445 ..1..1..0..0..0. .0..1..1..1..0. .0..1..1..0..1. .1..1..1..0..0 %Y A299445 Cf. A299451. %K A299445 nonn %O A299445 1,2 %A A299445 _R. H. Hardin_, Feb 10 2018