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 A068274 #9 May 02 2012 12:06:29 %S A068274 1,150,390750,17684490750,13905324304629750,189961153574587570713750, %T A068274 45086187185888873181881847687750, %U A068274 185916202268606023083570420269986443660750,13319440571031747382017558973436842742801064314274750 %N A068274 1/7 the number of colorings of an n X n rhombic hexagonal array with 7 colors. %C A068274 Terms for rhombic- and staggered- hexagonal arrays are the same for n in 1..4. %Y A068274 Cf. A068239-A068305, A000332, A002417, A027441, A212162, A212163. %K A068274 nonn %O A068274 1,2 %A A068274 _R. H. Hardin_, Feb 24 2002 %E A068274 a(7)-a(9) from _Alois P. Heinz_, May 02 2012