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 A068247 #13 Dec 20 2012 17:29:26 %S A068247 1,123273728,606966551329230,42294602754348892160, %T A068247 221621345837018832499375,227499859288036192921814016, %U A068247 76749554391225308000690033388,11559255542512176814494743592960,945121787128699657370828476884045,47886238054762718784097603771840000 %N A068247 1/6 the number of colorings of a 6 X 6 rhombic hexagonal array with n colors. %H A068247 Alois P. Heinz, <a href="/A068247/b068247.txt">Table of n, a(n) for n = 3..1000</a> %H A068247 Alois P. Heinz, <a href="/A068247/a068247.txt">Formula for A068247</a> %F A068247 a(n) = A212163(n,6)/6. - _Alois P. Heinz_, Dec 20 2012 %Y A068247 Cf. A068239-A068305, A000332, A002417, A027441, A212162, A212163. %K A068247 nonn %O A068247 3,2 %A A068247 _R. H. Hardin_, Feb 24 2002 %E A068247 Extended beyond a(7) by _Alois P. Heinz_, May 02 2012