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 A303454 #4 Apr 24 2018 10:20:43 %S A303454 32,2048,90112,4129588,189848373,8727953509,401405461699, %T A303454 18461936404456,849140799884830,39055765228960644,1796351602106938846, %U A303454 82622397275547501377,3800181265180961967638,174787695136683295423742 %N A303454 Number of nX6 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 A303454 Column 6 of A303456. %H A303454 R. H. Hardin, <a href="/A303454/b303454.txt">Table of n, a(n) for n = 1..210</a> %e A303454 Some solutions for n=5 %e A303454 ..0..0..1..0..1..0. .0..0..1..1..0..1. .0..0..0..0..1..0. .0..0..1..1..0..1 %e A303454 ..0..0..1..1..0..1. .0..0..0..0..1..0. .0..0..1..1..0..0. .0..0..0..0..1..0 %e A303454 ..0..0..1..1..0..0. .0..0..1..1..0..1. .0..0..1..1..0..0. .0..0..1..1..1..0 %e A303454 ..0..0..0..1..1..0. .0..0..1..0..1..1. .0..0..0..1..1..1. .0..0..1..1..0..0 %e A303454 ..0..0..1..1..0..0. .0..0..1..0..0..0. .0..0..1..0..0..1. .0..0..1..1..0..0 %Y A303454 Cf. A303456. %K A303454 nonn %O A303454 1,1 %A A303454 _R. H. Hardin_, Apr 24 2018