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 A275146 #4 Jul 17 2016 16:29:38 %S A275146 122,7776,10000,25344,41360,165568,663904,2695808,10930304,44604864, %T A275146 182448928,745425056,3044211024,12443779056,50916573248,208404032016, %U A275146 852924441248,3490340288512,14283233460800,58452748415536 %N A275146 Number of 6Xn 0..2 arrays with no element equal to any value at offset (-2,-2) (-1,-2) or (0,-1) and new values introduced in order 0..2. %C A275146 Row 6 of A275142. %H A275146 R. H. Hardin, <a href="/A275146/b275146.txt">Table of n, a(n) for n = 1..210</a> %F A275146 Empirical: a(n) = 13*a(n-1) -77*a(n-2) +286*a(n-3) -736*a(n-4) +1351*a(n-5) -1787*a(n-6) +1716*a(n-7) -1217*a(n-8) +652*a(n-9) -265*a(n-10) +78*a(n-11) -14*a(n-12) +a(n-13) for n>18 %e A275146 Some solutions for n=5 %e A275146 ..0..1..2..0..2. .0..1..0..2..0. .0..1..0..1..2. .0..1..2..0..2 %e A275146 ..2..0..1..2..0. .0..2..1..0..2. .0..2..1..2..1. .2..0..2..0..1 %e A275146 ..1..2..1..2..0. .1..2..1..0..2. .1..0..1..0..2. .1..0..1..2..1 %e A275146 ..0..2..0..1..0. .1..0..2..1..2. .1..0..2..1..0. .1..2..0..1..0 %e A275146 ..0..1..2..0..2. .2..0..2..1..0. .1..0..2..1..0. .1..2..0..1..2 %e A275146 ..0..2..1..0..1. .0..2..0..2..1. .0..2..0..2..0. .2..1..2..0..1 %Y A275146 Cf. A275142. %K A275146 nonn %O A275146 1,1 %A A275146 _R. H. Hardin_, Jul 17 2016