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 A068286 #9 May 03 2012 16:53:26 %S A068286 1,150,390750,17684490750,13905331460469750,189961376944305892137750, %T A068286 45086270412704540409445089549750, %U A068286 185916670055945278226619825124072763091750,13319483009963134380534870853035913218901916338644750 %N A068286 1/7 the number of colorings of an n X n staggered hexagonal array with 7 colors. %C A068286 Terms for rhombic- and staggered- hexagonal arrays are the same for n in 1..4. %Y A068286 Cf. A068239-A068305, A000332, A002417, A027441, A212194, A212195. %K A068286 nonn %O A068286 1,2 %A A068286 _R. H. Hardin_, Feb 24 2002 %E A068286 a(7)-a(9) from _Alois P. Heinz_, May 03 2012