A068279 1/12 the number of colorings of an n X n rhombic hexagonal array with 12 colors.

1, 1100, 100001000, 751345249556000, 466550155917485654168000, 23943119027381359392048801885920000, 101551583948290437017941221055210389140843072000, 35597235390075660655078813076577627044739757882304090775296000

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