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 A275503 #4 Jul 30 2016 20:00:02 %S A275503 365,69984,50000,73856,75024,346528,1643372,7886280,37846556, %T A275503 182923008,884628720,4276847052,20741192940,100647222904,488252256740, %U A275503 2372706557348,11527428408920,56008813182076,272332971514256 %N A275503 Number of nX7 0..2 arrays with no element equal to any value at offset (-2,-1) (-2,0) or (-1,-1) and new values introduced in order 0..2. %C A275503 Column 7 of A275504. %H A275503 R. H. Hardin, <a href="/A275503/b275503.txt">Table of n, a(n) for n = 1..210</a> %e A275503 Some solutions for n=4 %e A275503 ..0..0..1..2..1..0..1. .0..0..1..2..0..1..2. .0..0..0..1..1..2..2 %e A275503 ..2..1..1..2..0..0..2. .0..1..1..2..0..1..2. .1..2..1..1..2..0..0 %e A275503 ..2..1..2..0..0..2..2. .1..1..2..0..1..2..0. .1..2..1..2..2..0..1 %e A275503 ..1..0..0..0..1..2..1. .1..2..0..0..1..2..0. .2..0..0..2..0..1..2 %Y A275503 Cf. A275504. %K A275503 nonn %O A275503 1,1 %A A275503 _R. H. Hardin_, Jul 30 2016