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 A298925 #6 Jun 15 2020 14:00:56 %S A298925 0,1,1,11,94,955,15163,491338,19329083,1185260593 %N A298925 Number of n X n 0..1 arrays with every element equal to 2, 3, 5, 7 or 8 king-move adjacent elements, with upper left element zero. %C A298925 Diagonal of A298930. %e A298925 Some solutions for n=5 %e A298925 ..0..0..1..0..0. .0..0..1..0..0. .0..0..1..0..0. .0..0..1..0..0 %e A298925 ..0..1..0..1..0. .0..1..0..1..0. .1..0..1..1..0. .0..1..1..0..1 %e A298925 ..1..1..0..1..0. .0..1..1..1..0. .1..1..0..0..1. .1..0..0..1..1 %e A298925 ..0..1..0..1..0. .0..1..0..0..1. .0..1..1..1..0. .1..0..1..1..0 %e A298925 ..0..0..1..0..0. .0..0..1..1..1. .0..0..0..0..0. .1..1..0..0..0 %Y A298925 Cf. A298930. %K A298925 nonn %O A298925 1,4 %A A298925 _R. H. Hardin_, Jan 29 2018