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 A303107 #4 Apr 18 2018 12:42:37 %S A303107 0,1172,102952,5550469,436394066,32409609245,2441756629583, %T A303107 183384084351689,13794436866124300,1037425601212697006, %U A303107 78023920445683729803,5868131456816299629031,441338827948853709668453 %N A303107 Number of 7Xn 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 A303107 Row 7 of A303102. %H A303107 R. H. Hardin, <a href="/A303107/b303107.txt">Table of n, a(n) for n = 1..210</a> %e A303107 Some solutions for n=5 %e A303107 ..0..0..0..1..0. .0..0..0..0..0. .0..0..0..1..1. .0..0..0..1..0 %e A303107 ..0..0..0..0..1. .0..0..0..0..0. .0..0..0..0..0. .0..0..0..0..1 %e A303107 ..0..0..0..1..1. .1..0..1..0..1. .0..0..0..1..1. .0..0..0..1..1 %e A303107 ..1..1..1..0..1. .0..1..0..1..0. .0..1..0..0..0. .0..1..0..0..1 %e A303107 ..1..0..1..1..1. .1..0..1..0..1. .1..1..0..1..1. .1..0..1..0..0 %e A303107 ..0..0..1..0..1. .0..1..0..0..0. .1..0..0..1..0. .1..0..0..1..0 %e A303107 ..0..1..1..1..0. .1..1..1..1..0. .0..1..0..0..1. .1..1..1..0..1 %Y A303107 Cf. A303102. %K A303107 nonn %O A303107 1,2 %A A303107 _R. H. Hardin_, Apr 18 2018