A068275 1/8 the number of colorings of an n X n rhombic hexagonal array with 8 colors.

1, 252, 1679832, 296251234272, 1382247094854612672, 170624894466027144691360512, 557224605182442995086270684790287872, 48144796146667109603913695806315581931924703232, 110052419905312514544259421134157522506638480153437190868992

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(6)-a(9) from Alois P. Heinz, May 02 2012