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 A298134 #6 May 03 2020 15:43:52 %S A298134 0,1,0,10,88,917,14422,467043,17828062,1081228309 %N A298134 Number of n X n 0..1 arrays with every element equal to 2, 3, 5 or 7 king-move adjacent elements, with upper left element zero. %C A298134 Diagonal of A298139. %e A298134 Some solutions for n=7 %e A298134 ..0..0..1..1..1..0..0. .0..0..0..0..0..0..0. .0..0..1..0..0..0..1 %e A298134 ..0..1..0..1..0..0..1. .0..1..1..1..1..1..0. .0..1..1..1..0..1..1 %e A298134 ..1..0..0..1..1..1..1. .1..0..0..0..0..0..1. .0..1..0..1..0..0..1 %e A298134 ..1..1..1..0..0..0..0. .0..1..1..1..1..0..1. .0..1..0..0..1..1..0 %e A298134 ..1..0..1..0..1..1..0. .1..0..0..0..0..1..1. .0..1..0..1..0..0..0 %e A298134 ..0..0..1..0..1..0..1. .0..1..1..1..1..1..0. .0..1..0..1..0..1..0 %e A298134 ..0..1..1..0..0..1..1. .0..0..0..0..0..0..0. .0..0..1..0..1..1..1 %Y A298134 Cf. A298139. %K A298134 nonn %O A298134 1,4 %A A298134 _R. H. Hardin_, Jan 13 2018