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A145238 1/3 of the number of 3-colorings of an n X n array symmetric about both diagonal and antidiagonal. 0
1, 2, 8, 24, 144, 648, 5904, 40392, 561744, 5871528, 124982208, 2000735640, 65289654720, 1603001126808, 80277953271984, 3025716988718520, 232703590361105952, 13472417658155610888, 1592017750060187494896 (list; graph; refs; listen; history; internal format)
OFFSET

1,2

CROSSREFS

Sequence in context: A052624 A087982 A176475 * A093458 A088994 A141598

Adjacent sequences:  A145235 A145236 A145237 * A145239 A145240 A145241

KEYWORD

nonn

AUTHOR

R. H. Hardin (rhhardin(AT)att.net), Oct 05 2008

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Last modified February 18 00:14 EST 2012. Contains 206085 sequences.