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 A275348 #4 Jul 24 2016 10:01:37 %S A275348 14,486,1536,6156,31536,175152,982152,5645376,33154200,197081664, %T A275348 1176717272,7054784192,42406446716,255340091420,1538613779712, %U A275348 9277198809020,55956031182028,337589432181096,2036924853334720 %N A275348 Number of nX4 0..2 arrays with no element equal to any value at offset (-2,-1) (-2,1) or (-1,-2) and new values introduced in order 0..2. %C A275348 Column 4 of A275352. %H A275348 R. H. Hardin, <a href="/A275348/b275348.txt">Table of n, a(n) for n = 1..210</a> %e A275348 Some solutions for n=4 %e A275348 ..0..1..2..1. .0..1..0..0. .0..1..1..1. .0..0..1..0. .0..0..1..0 %e A275348 ..2..0..2..2. .1..1..1..0. .0..0..1..2. .2..1..2..1. .1..1..1..1 %e A275348 ..2..1..0..1. .0..2..2..2. .2..2..2..2. .2..2..1..2. .1..2..2..0 %e A275348 ..1..0..1..0. .2..2..2..0. .2..2..1..0. .2..1..0..0. .2..2..0..0 %Y A275348 Cf. A275352. %K A275348 nonn %O A275348 1,1 %A A275348 _R. H. Hardin_, Jul 24 2016