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 A277766 #4 Oct 29 2016 07:29:46 %S A277766 0,1584,220549,221983169,110036582827,67079817376928, %T A277766 38224184451654485,22257182633194608078,12869705874813306766481, %U A277766 7458446559929491293690613,4319259920844964071189461906,2501924582698962860252708115060 %N A277766 Number of nX7 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 A277766 Column 7 of A277767. %H A277766 R. H. Hardin, <a href="/A277766/b277766.txt">Table of n, a(n) for n = 1..17</a> %e A277766 Some solutions for n=2 %e A277766 ..0..1..2..0..1..2..0. .0..1..2..2..0..1..2. .0..1..2..0..2..1..0 %e A277766 ..2..1..2..0..1..0..1. .2..1..0..1..0..1..0. .2..2..0..1..0..2..2 %Y A277766 Cf. A277767. %K A277766 nonn %O A277766 1,2 %A A277766 _R. H. Hardin_, Oct 29 2016