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 A275227 #4 Jul 20 2016 18:27:53 %S A275227 365,46656,58301,441090,6380362,92831330,1368326231,20887845278, %T A275227 319348056936,4865299894416,74341935372850,1138486477148165, %U A275227 17435551839365877,267037909717137282,4091456524318196661 %N A275227 Number of nX7 0..2 arrays with no element equal to any value at offset (-2,-1) (-2,1) or (-1,0) and new values introduced in order 0..2. %C A275227 Column 7 of A275228. %H A275227 R. H. Hardin, <a href="/A275227/b275227.txt">Table of n, a(n) for n = 1..210</a> %e A275227 Some solutions for n=3 %e A275227 ..0..1..0..1..2..2..0. .0..0..0..0..0..0..0. .0..1..0..1..0..2..0 %e A275227 ..2..2..2..2..1..0..2. .1..2..1..1..1..2..1. .2..0..2..2..1..0..2 %e A275227 ..0..1..0..1..0..1..1. .2..1..2..2..2..1..2. .0..1..0..1..0..1..1 %Y A275227 Cf. A275228. %K A275227 nonn %O A275227 1,1 %A A275227 _R. H. Hardin_, Jul 20 2016