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 A326099 #4 Jun 06 2019 07:51:10 %S A326099 1,8,161,8628,1233763,463572941,457515856087,1187662505828132, %T A326099 8109848158608706092,145652282125715208618002, %U A326099 6879822326742091298103753274 %N A326099 Number of nXn 0..1 arrays with every element equal to 0, 1, 2, 3 or 6 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero. %C A326099 Diagonal of A326105. %e A326099 Some solutions for n=5 %e A326099 ..0..0..0..0..0. .0..0..0..0..0. .0..0..0..0..0. .0..0..0..0..1 %e A326099 ..1..0..1..1..1. .1..1..0..1..1. .1..0..1..0..1. .0..1..1..1..0 %e A326099 ..1..0..0..0..1. .1..0..1..0..1. .1..1..0..1..0. .0..1..0..0..0 %e A326099 ..1..1..0..1..0. .1..1..1..0..1. .1..0..0..1..1. .1..0..1..1..1 %e A326099 ..1..1..0..1..0. .0..0..0..0..1. .1..1..0..1..1. .0..1..0..1..0 %Y A326099 Cf. A326105. %K A326099 nonn %O A326099 1,2 %A A326099 _R. H. Hardin_, Jun 06 2019