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 A277765 #4 Oct 29 2016 07:28:56 %S A277765 0,356,21141,7824415,1487830718,343944986355,74591651561541, %T A277765 16513537201433122,3631417278822015869,800314315609344769958, %U A277765 176252542616326417994974,38825002002696841996583880 %N A277765 Number of nX6 0..2 arrays with every element equal to some element at offset (-1,-1) (-1,0) (-1,1) (0,-1) (0,1) or (1,0) both plus 1 mod 3 and minus 1 mod 3, with new values introduced in order 0..2. %C A277765 Column 6 of A277767. %H A277765 R. H. Hardin, <a href="/A277765/b277765.txt">Table of n, a(n) for n = 1..92</a> %e A277765 Some solutions for n=3 %e A277765 ..0..1..2..0..1..2. .0..1..0..2..1..2. .0..1..2..0..1..2. .0..1..0..2..2..1 %e A277765 ..2..1..0..0..2..0. .2..2..1..0..0..0. .2..0..2..1..2..0. .2..2..2..1..0..0 %e A277765 ..0..0..2..2..1..1. .1..0..2..1..1..2. .2..1..1..2..0..1. .0..1..0..0..2..1 %Y A277765 Cf. A277767. %K A277765 nonn %O A277765 1,2 %A A277765 _R. H. Hardin_, Oct 29 2016