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 A299734 #6 Jun 15 2020 14:54:42 %S A299734 1,8,220,21111,6896530,7790212998,30260326859957,404132235613627376, %T A299734 18556239226034408691425 %N A299734 Number of n X n 0..1 arrays with every element equal to 0, 1, 2, 3, 4, 5 or 8 king-move adjacent elements, with upper left element zero. %C A299734 Diagonal of A299740. %e A299734 Some solutions for n=5 %e A299734 ..0..0..0..0..0. .0..0..0..0..0. .0..0..0..0..0. .0..0..0..0..0 %e A299734 ..0..0..1..1..1. .0..1..1..0..1. .0..0..0..0..0. .0..1..1..0..1 %e A299734 ..1..0..1..1..1. .0..0..1..1..0. .0..0..0..0..0. .0..0..1..1..0 %e A299734 ..0..0..1..1..1. .1..1..1..0..1. .1..1..1..1..1. .1..1..0..1..1 %e A299734 ..0..1..0..0..0. .0..1..0..0..0. .1..0..1..0..0. .1..0..0..1..0 %Y A299734 Cf. A299740. %K A299734 nonn %O A299734 1,2 %A A299734 _R. H. Hardin_, Feb 18 2018