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 A302727 #4 Apr 12 2018 10:53:48 %S A302727 8,98,363,1723,16265,89121,532511,4281120,26823700,176193198, %T A302727 1287161045,8543705276,58177418523,410055506135,2784959794292, %U A302727 19190983835759,133544369858762,915736969076289,6331727880485698,43862835910755482 %N A302727 Number of nX7 0..1 arrays with every element equal to 1, 2, 4 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero. %C A302727 Column 7 of A302728. %H A302727 R. H. Hardin, <a href="/A302727/b302727.txt">Table of n, a(n) for n = 1..210</a> %e A302727 Some solutions for n=5 %e A302727 ..0..1..1..1..0..1..1. .0..0..1..0..0..1..0. .0..1..1..0..1..1..1 %e A302727 ..0..0..0..0..0..0..0. .1..1..1..1..1..0..0. .0..0..0..1..1..0..1 %e A302727 ..0..0..1..0..0..0..1. .1..0..0..0..1..0..0. .1..0..0..0..1..0..0 %e A302727 ..0..1..1..1..0..1..1. .1..0..1..0..1..1..1. .0..1..1..0..1..1..0 %e A302727 ..1..0..1..0..1..0..1. .1..1..1..1..1..0..0. .1..0..1..1..1..0..1 %Y A302727 Cf. A302728. %K A302727 nonn %O A302727 1,1 %A A302727 _R. H. Hardin_, Apr 12 2018