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 A276297 #4 Aug 28 2016 08:25:52 %S A276297 16,324,2765,33461,408105,4988145,61239977,752660245,9254592049, %T A276297 113817204341,1399867249821,17217717400933,211770912156897, %U A276297 2604690694931325,32036472371696501,394032445053865405 %N A276297 Number of nX6 0..2 arrays with no element equal to any value at offset (-2,-1) (-1,1) or (0,-1) and new values introduced in order 0..2. %C A276297 Column 6 of A276299. %H A276297 R. H. Hardin, <a href="/A276297/b276297.txt">Table of n, a(n) for n = 1..210</a> %H A276297 R. H. Hardin, <a href="/A276297/a276297.txt">Empirical recurrence of order 70</a> %F A276297 Empirical recurrence of order 70 (see link above) %e A276297 Some solutions for n=4 %e A276297 ..0..1..2..0..2..1. .0..1..2..0..2..0. .0..1..0..1..0..1. .0..1..0..2..0..2 %e A276297 ..0..1..2..1..2..1. .2..1..2..0..1..2. .0..1..0..1..2..0. .0..2..0..1..0..2 %e A276297 ..0..1..2..0..2..1. .0..1..2..0..1..0. .2..1..0..1..2..1. .0..2..0..2..0..1 %e A276297 ..0..1..2..1..2..0. .2..1..2..0..1..0. .2..1..2..1..0..1. .0..2..1..2..0..2 %Y A276297 Cf. A276299. %K A276297 nonn %O A276297 1,1 %A A276297 _R. H. Hardin_, Aug 28 2016