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 A269274 #4 Feb 21 2016 08:56:14 %S A269274 1620,1104264,474819408,174924572760,59587625651904,19356924219624936, %T A269274 6090616046325570480,1872977567099580289656,566116324214731470647712, %U A269274 168820920854627863029497352,49802534018235803452666079376 %N A269274 Number of nX6 0..3 arrays with some element plus some horizontally or antidiagonally adjacent neighbor totalling three exactly once. %C A269274 Column 6 of A269276. %H A269274 R. H. Hardin, <a href="/A269274/b269274.txt">Table of n, a(n) for n = 1..210</a> %F A269274 Empirical: a(n) = 564*a(n-1) -87462*a(n-2) +2257724*a(n-3) -21169617*a(n-4) +76236552*a(n-5) -92236816*a(n-6) for n>7 %e A269274 Some solutions for n=2 %e A269274 ..0..0..1..0..2..1. .0..0..0..2..3..1. .0..0..2..2..3..1. .0..0..1..2..0..2 %e A269274 ..2..0..2..0..1..3. .2..0..3..3..1..3. .1..0..2..0..0..0. .1..1..0..1..3..2 %Y A269274 Cf. A269276. %K A269274 nonn %O A269274 1,1 %A A269274 _R. H. Hardin_, Feb 21 2016