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 A269184 #4 Feb 20 2016 09:13:26 %S A269184 1620,118032,12791896,1265974992,121792778352,11426543880704, %T A269184 1052109184130840,95454531912315856,8558619944786977592, %U A269184 760020559893342078688,66953271981144607663880,5858534813761786497448832 %N A269184 Number of nX6 0..3 arrays with some element plus some horizontally, diagonally, antidiagonally or vertically adjacent neighbor totalling three exactly once. %C A269184 Column 6 of A269186. %H A269184 R. H. Hardin, <a href="/A269184/b269184.txt">Table of n, a(n) for n = 1..210</a> %e A269184 Some solutions for n=2 %e A269184 ..2..3..3..3..2..1. .3..2..3..1..1..0. .0..0..2..1..0..0. .1..0..0..2..2..2 %e A269184 ..3..3..3..3..3..3. .2..2..3..1..3..1. .2..2..0..0..0..2. .0..0..2..3..2..0 %Y A269184 Cf. A269186. %K A269184 nonn %O A269184 1,1 %A A269184 _R. H. Hardin_, Feb 20 2016