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 A276302 #4 Aug 28 2016 08:30:00 %S A276302 41,88,805,5965,50949,408105,3363533,27372713,224012077,1828722821, %T A276302 14945190941,122079734781,997423034925,8148425295997,66571199181721, %U A276302 543864761405757,4443232843935221,36299916368689017,296560213286564513 %N A276302 Number of 5Xn 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 A276302 Row 5 of A276299. %H A276302 R. H. Hardin, <a href="/A276302/b276302.txt">Table of n, a(n) for n = 1..210</a> %F A276302 Empirical: a(n) = 3*a(n-1) +33*a(n-2) +66*a(n-3) +94*a(n-4) -115*a(n-5) -155*a(n-6) -255*a(n-7) +236*a(n-8) +152*a(n-9) +61*a(n-10) -213*a(n-11) +90*a(n-12) -5*a(n-13) +13*a(n-14) -4*a(n-15) for n>17 %e A276302 Some solutions for n=4 %e A276302 ..0..1..2..1. .0..1..0..1. .0..1..0..1. .0..1..2..1. .0..1..0..1 %e A276302 ..2..1..2..1. .0..2..0..2. .0..1..0..1. .2..0..2..0. .0..1..0..1 %e A276302 ..2..1..0..1. .0..1..0..2. .2..1..2..1. .2..1..2..0. .0..1..2..1 %e A276302 ..2..1..2..0. .2..1..0..1. .2..1..2..1. .2..0..2..0. .2..1..0..2 %e A276302 ..2..1..2..1. .2..1..0..2. .2..0..2..0. .2..1..2..1. .0..2..0..1 %Y A276302 Cf. A276299. %K A276302 nonn %O A276302 1,1 %A A276302 _R. H. Hardin_, Aug 28 2016