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 A303100 #6 Apr 19 2023 07:50:08 %S A303100 5,601,19393,709333,25372284,906385523,32409609245,1158734336743, %T A303100 41428642572259,1481227171330646,52959204974173538, %U A303100 1893483989293507505,67698924831526337056,2420482299622384467005,86541028547861499552982 %N A303100 Number of n X 6 0..1 arrays with every element equal to 1, 2, 3, 4 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero. %C A303100 Column 6 of A303102. %H A303100 R. H. Hardin, <a href="/A303100/b303100.txt">Table of n, a(n) for n = 1..210</a> %e A303100 Some solutions for n=5 %e A303100 ..0..1..1..0..0..1. .0..0..1..0..1..0. .0..0..0..1..1..1. .0..0..1..0..1..0 %e A303100 ..0..0..0..1..1..0. .0..0..0..1..0..0. .0..0..1..0..1..1. .0..0..0..1..0..1 %e A303100 ..0..0..1..1..0..0. .0..0..1..1..1..0. .0..0..1..0..0..1. .0..0..1..1..0..0 %e A303100 ..0..0..1..1..1..0. .0..0..1..1..1..1. .0..0..1..1..1..1. .0..0..1..1..0..0 %e A303100 ..0..0..0..1..1..1. .0..0..0..0..0..1. .0..0..1..0..0..1. .0..0..0..0..1..1 %Y A303100 Cf. A303102. %K A303100 nonn %O A303100 1,1 %A A303100 _R. H. Hardin_, Apr 18 2018