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 A276304 #4 Aug 28 2016 08:31:55 %S A276304 365,710,14693,203933,3861469,61239977,1073114625,17768699385, %T A276304 303744206293,5099725153529,86493302028957,1458615553542913, %U A276304 24677069062558769,416736142368242189,7044833158816604637 %N A276304 Number of 7Xn 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 A276304 Row 7 of A276299. %H A276304 R. H. Hardin, <a href="/A276304/b276304.txt">Table of n, a(n) for n = 1..210</a> %H A276304 R. H. Hardin, <a href="/A276304/a276304.txt">Empirical recurrence of order 59</a> %F A276304 Empirical recurrence of order 59 (see link above) %e A276304 Some solutions for n=3 %e A276304 ..0..1..0. .0..1..2. .0..1..2. .0..1..2. .0..1..0. .0..1..0. .0..1..2 %e A276304 ..2..1..2. .0..1..0. .2..1..2. .2..1..0. .2..1..0. .2..1..0. .2..1..0 %e A276304 ..2..1..2. .2..1..0. .0..1..2. .2..1..0. .0..1..0. .0..1..2. .2..1..2 %e A276304 ..2..1..2. .0..1..0. .2..1..0. .2..1..2. .0..1..2. .0..1..2. .0..1..2 %e A276304 ..2..1..2. .0..1..0. .0..1..2. .0..1..2. .2..1..0. .0..1..0. .2..1..0 %e A276304 ..2..0..2. .0..1..2. .0..1..2. .2..0..2. .2..1..2. .0..1..0. .0..1..2 %e A276304 ..2..1..0. .0..1..0. .0..1..2. .2..1..2. .2..1..0. .2..1..2. .2..1..2 %Y A276304 Cf. A276299. %K A276304 nonn %O A276304 1,1 %A A276304 _R. H. Hardin_, Aug 28 2016