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 A266185 #6 Aug 12 2016 06:53:59 %S A266185 24,384,7768,226296,7089448,253282792,9451853336,371640077992, %T A266185 15004890740488,621421685721976,26174574774860264,1119055728709553688, %U A266185 48396501869679377480,2113991818229740211832,93107795487773857584184 %N A266185 Number of 4Xn arrays containing n copies of 0..4-1 with no element plus any diagonal or antidiagonal neighbor equal to 4-1. %C A266185 Row 4 of A266183. %H A266185 R. H. Hardin, <a href="/A266185/b266185.txt">Table of n, a(n) for n = 1..16</a> %e A266185 Some solutions for n=3 %e A266185 ..2..1..2....3..1..2....0..0..2....3..1..0....2..3..2....1..3..0....1..3..1 %e A266185 ..0..3..0....1..3..0....1..0..2....0..2..0....1..0..3....2..0..3....3..3..2 %e A266185 ..3..2..1....3..1..2....2..3..1....2..1..2....1..3..0....0..3..2....1..2..2 %e A266185 ..3..1..0....0..2..0....1..3..3....1..3..3....2..0..1....1..2..1....0..0..0 %Y A266185 Cf. A266183. %K A266185 nonn %O A266185 1,1 %A A266185 _R. H. Hardin_, Dec 23 2015