A068285 1/6 the number of colorings of an n X n staggered hexagonal array with 6 colors.

1, 80, 65600, 552093440, 47695073906240, 42295002762341131520, 384997602083152626170331200, 35973286295593063089098993201626880, 34502872879799250159432202960093141227521600

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(7)-a(9) from Alois P. Heinz, May 03 2012