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Search: id:A145238
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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
1, 2, 8, 24, 144, 648, 5904, 40392, 561744, 5871528, 124982208, 2000735640, 65289654720, 1603001126808, 80277953271984, 3025716988718520, 232703590361105952, 13472417658155610888, 1592017750060187494896 (list; graph; listen)
OFFSET

1,2
CROSSREFS

Sequence in context: A123775 A052624 A087982 this_sequence A093458 A088994 A141598

Adjacent sequences: A145235 A145236 A145237 this_sequence A145239 A145240 A145241

KEYWORD

nonn

AUTHOR

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

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Last modified December 4 12:48 EST 2009. Contains 170310 sequences.

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