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 A297806 #4 Jan 06 2018 09:35:42 %S A297806 1,31,2434,17899,231921,5511367,123361724,2122878239,39737434692, %T A297806 798393620079,15715764101797,301272429965474,5838287390984909, %U A297806 114058126922015948,2220151290688134573,43095024081743706131 %N A297806 Number of 6Xn 0..1 arrays with every 1 horizontally, diagonally or antidiagonally adjacent to 2, 3 or 5 neighboring 1s. %C A297806 Row 6 of A297802. %H A297806 R. H. Hardin, <a href="/A297806/b297806.txt">Table of n, a(n) for n = 1..210</a> %e A297806 Some solutions for n=4 %e A297806 ..1..1..0..0. .0..0..1..1. .1..1..0..0. .0..1..1..0. .0..1..1..1 %e A297806 ..1..1..0..0. .0..1..1..1. .1..1..0..0. .1..1..0..0. .1..1..1..0 %e A297806 ..0..0..0..0. .0..1..1..1. .0..0..0..0. .0..0..0..0. .1..1..1..1 %e A297806 ..0..0..0..0. .1..1..0..0. .0..0..1..1. .0..1..1..0. .0..0..1..0 %e A297806 ..0..0..0..0. .0..1..1..1. .0..1..1..0. .0..1..1..0. .1..1..1..0 %e A297806 ..0..0..0..0. .0..0..1..0. .1..1..0..0. .0..1..1..0. .0..1..0..0 %Y A297806 Cf. A297802. %K A297806 nonn %O A297806 1,2 %A A297806 _R. H. Hardin_, Jan 06 2018