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 A068290 #8 May 03 2012 16:57:40 %S A068290 1,2940,1475791800,126483570405921120,1850863560812354903891313720, %T A068290 4624299555529247811516226596312142467360, %U A068290 1972644284777133055191294794721562929045198175857072600,143675548262637787606663854942059513336275448208739220399687693160870240 %N A068290 1/16 the number of colorings of an n X n staggered hexagonal array with 16 colors. %C A068290 Terms for rhombic- and staggered- hexagonal arrays are the same for n in 1..4. %Y A068290 Cf. A068239-A068305, A000332, A002417, A027441, A212194, A212195. %K A068290 nonn %O A068290 1,2 %A A068290 _R. H. Hardin_, Feb 24 2002 %E A068290 a(5)-a(8) from _Alois P. Heinz_, May 03 2012