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 A269287 #4 Feb 21 2016 09:25:35 %S A269287 2592,1363572,544118148,193446959076,64538382287988,20680187784811380, %T A269287 6444304707617709156,1967513283560471350788,591384314583314302090068, %U A269287 175574678705837994574453140,51607712999525045688100012356 %N A269287 Number of nX6 0..3 arrays with some element plus some horizontally or antidiagonally adjacent neighbor totalling three no more than once. %C A269287 Column 6 of A269289. %H A269287 R. H. Hardin, <a href="/A269287/b269287.txt">Table of n, a(n) for n = 1..210</a> %F A269287 Empirical: a(n) = 564*a(n-1) -87462*a(n-2) +2257724*a(n-3) -21169617*a(n-4) +76236552*a(n-5) -92236816*a(n-6) for n>7 %e A269287 Some solutions for n=2 %e A269287 ..0..0..2..3..1..0. .0..0..0..3..3..2. .0..0..0..0..1..0. .0..0..1..2..0..1 %e A269287 ..2..2..3..1..1..1. .1..0..2..2..0..0. .1..2..2..0..2..2. .1..1..3..1..3..2 %Y A269287 Cf. A269289. %K A269287 nonn %O A269287 1,1 %A A269287 _R. H. Hardin_, Feb 21 2016