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 A275350 #4 Jul 24 2016 10:03:30 %S A275350 122,17496,43712,239112,2292520,26615196,306863916,3682615020, %T A275350 45094867336,548546009720,6672893379012,81689346860320, %U A275350 1000861101302288,12247744575368296,149860413965057960,1835629996533353880 %N A275350 Number of nX6 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 A275350 Column 6 of A275352. %H A275350 R. H. Hardin, <a href="/A275350/b275350.txt">Table of n, a(n) for n = 1..86</a> %e A275350 Some solutions for n=3 %e A275350 ..0..1..2..0..2..1. .0..1..2..1..2..0. .0..1..1..1..1..1. .0..1..0..0..0..2 %e A275350 ..1..0..1..0..1..2. .2..2..1..2..1..2. .1..1..1..2..2..2. .0..2..2..0..1..1 %e A275350 ..2..1..2..1..2..1. .2..1..0..1..2..1. .0..2..2..0..2..0. .2..1..2..1..1..2 %Y A275350 Cf. A275352. %K A275350 nonn %O A275350 1,1 %A A275350 _R. H. Hardin_, Jul 24 2016