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A068283 1/4 the number of colorings of an n X n staggered hexagonal array with 4 colors. 0
1, 12, 264, 11424, 1009608, 185900256, 71883991272, 58646051219616 (list; graph; refs; listen; history; internal format)
OFFSET

1,2

COMMENTS

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

CROSSREFS

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

Sequence in context: A035265 A167869 A068271 * A003390 A107485 A117415

Adjacent sequences:  A068280 A068281 A068282 * A068284 A068285 A068286

KEYWORD

nonn

AUTHOR

R. H. Hardin (rhhardin(AT)att.net), Feb 24 2002

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Last modified February 14 14:07 EST 2012. Contains 205623 sequences.