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 A275182 #7 Jul 20 2016 18:16:05 %S A275182 365,4096,4021,5653,25241,117916,561044,2688402,12931103,62408531, %T A275182 302138208,1466387881,7128875693,34691973269,168923525976, %U A275182 822823965071,4008952988381,19536216274450,95219416747615,464168982600409 %N A275182 Number of nX7 0..2 arrays with no element equal to any value at offset (-2,-1) (-1,0) or (-1,1) and new values introduced in order 0..2. %C A275182 Column 7 of A275183. %H A275182 R. H. Hardin, <a href="/A275182/b275182.txt">Table of n, a(n) for n = 1..210</a> %H A275182 R. H. Hardin, <a href="/A275182/a275182.txt">Empirical recurrence</a> %F A275182 Empirical recurrence of order 67 (see link above) %e A275182 Some solutions for n=4 %e A275182 ..0..0..0..0..1..2..0. .0..0..1..2..0..0..1. .0..1..1..1..2..2..0 %e A275182 ..2..2..2..2..0..1..2. .2..2..0..1..1..2..2. .2..2..0..0..1..1..2 %e A275182 ..0..1..1..1..2..0..1. .1..1..2..0..0..1..1. .1..1..2..2..0..0..0 %e A275182 ..2..0..0..0..1..2..2. .2..0..1..1..2..0..0. .2..0..0..1..1..2..2 %Y A275182 Cf. A275183. %K A275182 nonn %O A275182 1,1 %A A275182 _R. H. Hardin_, Jul 19 2016