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 A302211 #6 May 04 2021 14:45:22 %S A302211 1,123,72,424,1868,11170,55922,291320,1544411,8168814,43135601, %T A302211 228337677,1208744793,6398223796,33881994478,179433657982, %U A302211 950232876834,5032989751367,26658489563077,141204904014504,747985019374304 %N A302211 Number of n X 7 0..1 arrays with every element equal to 0, 2 or 3 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero. %C A302211 Column 7 of A302212. %H A302211 R. H. Hardin, <a href="/A302211/b302211.txt">Table of n, a(n) for n = 1..199</a> %e A302211 Some solutions for n=5 %e A302211 ..0..0..1..1..0..0..0. .0..1..1..0..0..1..1. .0..1..1..1..0..0..0 %e A302211 ..0..0..1..1..0..0..1. .1..1..0..0..1..1..0. .1..1..0..0..1..0..0 %e A302211 ..1..0..0..1..1..0..1. .0..1..1..0..1..1..0. .0..1..1..0..1..1..1 %e A302211 ..0..0..1..1..0..0..1. .0..1..1..0..0..1..1. .0..1..0..0..0..1..0 %e A302211 ..1..0..0..1..1..0..0. .1..1..0..0..0..1..1. .1..1..1..0..0..1..0 %Y A302211 Cf. A302212. %K A302211 nonn %O A302211 1,2 %A A302211 _R. H. Hardin_, Apr 03 2018