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A068257 1/7 the number of colorings of an n X n square array with 7 colors. 0
1, 186, 923526, 122408393436, 433110977725751106, 40908457493732914322944536 (list; graph; refs; listen; history; internal format)
OFFSET

1,2

CROSSREFS

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

Sequence in context: A161619 A206515 A146502 * A086000 A155544 A081703

Adjacent sequences:  A068254 A068255 A068256 * A068258 A068259 A068260

KEYWORD

nonn

AUTHOR

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

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Last modified February 14 23:16 EST 2012. Contains 205687 sequences.