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A068292 1/18 times the number of colorings of an n X n staggered hexagonal array with 18 colors. 0
1, 4352, 4294971392, 961201829493850112 (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: A145916 A048900 A170786 * A185796 A154084 A203928

Adjacent sequences:  A068289 A068290 A068291 * A068293 A068294 A068295

KEYWORD

nonn

AUTHOR

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

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Last modified February 14 17:10 EST 2012. Contains 205644 sequences.