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 A275349 #4 Jul 24 2016 10:02:40 %S A275349 41,2916,8192,38256,266116,2130176,17258544,142784608,1211010160, %T A275349 10285035212,87568199684,747721216556,6400345721356,54771077737784, %U A275349 468884291240428,4015074510069276,34391615022020280,294557258897550780 %N A275349 Number of nX5 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 A275349 Column 5 of A275352. %H A275349 R. H. Hardin, <a href="/A275349/b275349.txt">Table of n, a(n) for n = 1..204</a> %e A275349 Some solutions for n=4 %e A275349 ..0..1..0..2..0. .0..0..0..1..0. .0..1..1..1..2. .0..0..1..2..1 %e A275349 ..1..0..1..2..1. .1..2..1..2..2. .2..2..2..0..2. .0..1..2..1..0 %e A275349 ..0..1..0..1..0. .1..1..2..1..0. .0..2..0..0..0. .1..2..1..2..1 %e A275349 ..2..0..1..2..1. .0..0..0..0..0. .0..0..1..1..1. .2..1..2..1..0 %Y A275349 Cf. A275352. %K A275349 nonn %O A275349 1,1 %A A275349 _R. H. Hardin_, Jul 24 2016