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 A318069 #4 Aug 15 2018 13:16:54 %S A318069 1,6,18,73,316,3029,46884,935951,38183961,2877277695,323244675173, %T A318069 63938089963412,22744080515948233,13243562482553493420 %N A318069 Number of nXn 0..1 arrays with every element unequal to 0, 1, 2 or 5 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero. %C A318069 Diagonal of A318075. %e A318069 Some solutions for n=5 %e A318069 ..0..0..0..0..0. .0..1..1..1..0. .0..1..1..1..0. .0..0..0..0..0 %e A318069 ..0..1..1..0..0. .1..1..1..1..0. .1..1..1..0..0. .0..0..0..0..0 %e A318069 ..0..0..0..1..0. .1..1..1..1..0. .1..1..0..0..1. .0..0..0..0..0 %e A318069 ..0..0..0..1..0. .1..0..1..1..0. .1..0..0..1..1. .0..1..1..0..0 %e A318069 ..0..0..0..0..0. .0..1..1..1..0. .0..0..1..1..1. .0..0..0..0..1 %Y A318069 Cf. A318075. %K A318069 nonn %O A318069 1,2 %A A318069 _R. H. Hardin_, Aug 15 2018