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 A275356 #4 Jul 24 2016 10:08:10 %S A275356 122,3456,16956,175152,2130176,26615196,351504904,4681346476, %T A275356 62600128172,840740447848,11302164467116,152036300837588, %U A275356 2045851077415224,27533784482988444,370572411439612120,4987688003464417032 %N A275356 Number of 6Xn 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 A275356 Row 6 of A275352. %H A275356 R. H. Hardin, <a href="/A275356/b275356.txt">Table of n, a(n) for n = 1..127</a> %e A275356 Some solutions for n=4 %e A275356 ..0..0..1..0. .0..1..0..1. .0..0..0..1. .0..0..0..0. .0..1..0..0 %e A275356 ..0..0..1..1. .1..0..2..2. .1..2..1..2. .1..0..1..2. .0..0..1..0 %e A275356 ..1..2..2..2. .2..2..2..1. .1..1..2..1. .2..1..2..1. .2..1..2..2 %e A275356 ..2..2..2..0. .1..0..1..1. .1..0..0..2. .1..2..1..2. .1..2..1..0 %e A275356 ..0..0..0..0. .0..1..0..1. .0..0..2..1. .0..1..2..0. .0..1..0..0 %e A275356 ..0..1..1..1. .2..2..2..2. .2..2..1..1. .1..0..1..0. .0..2..1..2 %Y A275356 Cf. A275352. %K A275356 nonn %O A275356 1,1 %A A275356 _R. H. Hardin_, Jul 24 2016