A068290 1/16 the number of colorings of an n X n staggered hexagonal array with 16 colors.

1, 2940, 1475791800, 126483570405921120, 1850863560812354903891313720, 4624299555529247811516226596312142467360, 1972644284777133055191294794721562929045198175857072600, 143675548262637787606663854942059513336275448208739220399687693160870240

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, A212194, A212195.

Extensions

a(5)-a(8) from Alois P. Heinz, May 03 2012