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 A293105 #6 Apr 06 2020 00:08:43 %S A293105 0,520,30837,1710994,96199260,5589631828,328979478088,19603705394914, %T A293105 1178814839256659,71387656909124036,4347717462205577512, %U A293105 266011573509307925450,16337878757403766119544,1006670823452543129707514 %N A293105 Number of 6 X n 0..1 arrays with the number of 1's horizontally, diagonally or antidiagonally adjacent to some 0 two less than the number of 0's adjacent to some 1. %C A293105 Row 6 of A293100. %H A293105 R. H. Hardin, <a href="/A293105/b293105.txt">Table of n, a(n) for n = 1..28</a> %e A293105 Some solutions for n=3 %e A293105 ..1..0..0. .0..0..0. .0..0..0. .1..0..1. .1..1..0. .0..1..1. .1..0..1 %e A293105 ..0..0..0. .1..0..1. .1..1..0. .1..0..0. .0..0..0. .0..1..0. .0..0..0 %e A293105 ..1..0..0. .1..1..0. .1..1..0. .0..0..0. .1..0..0. .0..0..1. .0..1..1 %e A293105 ..1..0..1. .0..1..0. .1..0..1. .0..0..0. .0..1..1. .0..0..1. .0..0..0 %e A293105 ..0..0..0. .0..0..1. .1..1..0. .0..0..1. .0..0..0. .1..0..0. .1..0..1 %e A293105 ..0..1..1. .0..1..0. .0..0..0. .0..0..0. .1..1..1. .1..1..0. .0..1..1 %Y A293105 Cf. A293100. %K A293105 nonn %O A293105 1,2 %A A293105 _R. H. Hardin_, Sep 30 2017