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A068417 Number of partitionings of n X n checkerboard into three edgewise-connected sets. 0
0, 4, 258, 10830, 709351 (list; graph; refs; listen; history; internal format)
OFFSET

1,2

CROSSREFS

Sequence in context: A057156 A132656 A137840 * A116967 A003382 A112982

Adjacent sequences:  A068414 A068415 A068416 * A068418 A068419 A068420

KEYWORD

nonn

AUTHOR

R. H. Hardin (rhhardin(AT)att.net), Mar 02 2002

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Last modified February 17 16:48 EST 2012. Contains 206058 sequences.