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 A276295 #4 Aug 28 2016 08:23:48 %S A276295 4,36,173,1017,5965,34865,203933,1192701,6974781,40786925,238509373, %T A276295 1394719389,8155807421,47692103389,278885349565,1630815353885, %U A276295 9536385985277,55765143107101,326093248975229,1906868691945053 %N A276295 Number of nX4 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 A276295 Column 4 of A276299. %H A276295 R. H. Hardin, <a href="/A276295/b276295.txt">Table of n, a(n) for n = 1..210</a> %F A276295 Empirical: a(n) = 9*a(n-1) -20*a(n-2) +17*a(n-3) -65*a(n-4) +116*a(n-5) -40*a(n-6) +124*a(n-7) -172*a(n-8) +16*a(n-9) -48*a(n-10) +64*a(n-11) for n>13 %e A276295 Some solutions for n=4 %e A276295 ..0..1..0..2. .0..1..2..0. .0..1..0..1. .0..1..0..1. .0..1..0..2 %e A276295 ..0..1..0..2. .2..1..2..0. .0..2..0..2. .0..2..0..2. .0..2..0..1 %e A276295 ..2..1..0..1. .0..1..2..0. .1..2..0..2. .1..2..0..2. .0..1..0..1 %e A276295 ..0..1..0..2. .2..0..2..1. .1..2..1..2. .0..2..0..1. .0..1..0..1 %Y A276295 Cf. A276299. %K A276295 nonn %O A276295 1,1 %A A276295 _R. H. Hardin_, Aug 28 2016