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 A295775 #6 Apr 26 2020 20:53:26 %S A295775 2,9,56,1059,37897,2602065,409525082,128171125105,83333126432833, %T A295775 114403160523019326,323325261181740261922,1905368274130445991781276 %N A295775 Number of n X n 0..1 arrays with each 1 adjacent to 0 or 2 king-move neighboring 1's. %C A295775 Diagonal of A295781. %e A295775 Some solutions for n=5 %e A295775 ..1..0..0..0..0. .1..0..0..0..1. .1..0..0..0..1. .1..0..0..1..1 %e A295775 ..0..0..0..0..0. .0..0..0..0..0. .1..1..0..0..0. .0..0..0..0..1 %e A295775 ..0..1..1..0..0. .0..0..1..0..0. .0..0..0..1..0. .1..0..0..0..0 %e A295775 ..1..0..0..1..0. .1..0..0..0..0. .1..0..0..0..0. .0..0..0..1..1 %e A295775 ..0..1..1..0..0. .0..0..0..1..0. .0..0..1..0..1. .1..0..0..1..0 %Y A295775 Cf. A295781. %K A295775 nonn %O A295775 1,1 %A A295775 _R. H. Hardin_, Nov 27 2017