A068282 1/15 the number of colorings of an n X n rhombic hexagonal array with 15 colors.

1, 2366, 815732918, 40982736076490390, 300036182355657182688325982, 320085523640263850036240170626275000126, 49759746073476452859128357237174600753071750263576974, 1127223407032446992094203888014898257130328919220827996504247743755014

Offset: 1

Author

R. H. Hardin, Feb 24 2002

Keywords

• nonn

Comments

Terms for rhombic- and staggered- hexagonal arrays are the same for n in 1..4.

Crossrefs

Cf. A068239-A068305, A000332, A002417, A027441, A212162, A212163.

Extensions

a(5)-a(8) from Alois P. Heinz, May 02 2012