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 A302431 #4 Apr 07 2018 17:24:49 %S A302431 32,42,93,362,992,4231,14764,53851,182216,685166,2496115,9055292, %T A302431 32007765,116943901,427027396,1549343892,5552467791,20133254864, %U A302431 73288484477,265972968443,958816836857,3470377190140,12600871895519 %N A302431 Number of 6Xn 0..1 arrays with every element equal to 0, 1, 3 or 5 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero. %C A302431 Row 6 of A302427. %H A302431 R. H. Hardin, <a href="/A302431/b302431.txt">Table of n, a(n) for n = 1..210</a> %e A302431 Some solutions for n=5 %e A302431 ..0..1..1..1..0. .0..1..0..1..0. .0..1..0..0..0. .0..0..0..0..1 %e A302431 ..0..1..0..0..0. .0..1..0..1..0. .0..1..1..1..0. .0..1..1..0..1 %e A302431 ..0..1..0..1..0. .1..1..0..1..1. .0..1..0..1..0. .0..1..0..1..0 %e A302431 ..0..1..0..1..0. .0..1..0..1..0. .0..1..0..1..0. .1..1..1..1..0 %e A302431 ..0..1..0..1..0. .0..1..0..1..0. .0..1..0..1..0. .1..1..0..0..0 %e A302431 ..1..0..0..1..0. .1..0..0..1..0. .0..1..0..1..0. .0..1..0..1..0 %Y A302431 Cf. A302427. %K A302431 nonn %O A302431 1,1 %A A302431 _R. H. Hardin_, Apr 07 2018