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 A303455 #4 Apr 24 2018 10:21:26 %S A303455 64,8192,658204,55681352,4729712941,401712282811,34135836415352, %T A303455 2900896415900109,246526793165030703,20950755659230072765, %U A303455 1780476037311841468019,151311828052607951348154 %N A303455 Number of nX7 0..1 arrays with every element equal to 0, 1, 2, 3, 4 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero. %C A303455 Column 7 of A303456. %H A303455 R. H. Hardin, <a href="/A303455/b303455.txt">Table of n, a(n) for n = 1..210</a> %e A303455 Some solutions for n=5 %e A303455 ..0..0..0..1..1..1..1. .0..0..0..1..1..1..1. .0..0..0..1..0..1..0 %e A303455 ..0..0..0..0..0..0..0. .0..0..0..0..1..0..0. .0..0..0..0..1..0..0 %e A303455 ..0..0..0..1..1..0..0. .0..0..0..1..0..1..1. .0..0..0..1..1..0..1 %e A303455 ..0..0..0..1..0..0..1. .0..0..0..1..0..1..1. .0..0..0..1..0..0..0 %e A303455 ..0..0..0..1..1..1..1. .0..1..0..1..1..0..0. .0..1..0..1..1..0..0 %Y A303455 Cf. A303456. %K A303455 nonn %O A303455 1,1 %A A303455 _R. H. Hardin_, Apr 24 2018