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Search: id:A145240
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A145240 1/4 of the number of 4-colorings of an n X n array symmetric about main diagonal. +0
1
1, 9, 189, 9261, 1059723, 283237101, 176834417193, 257902966790973, 878667709192614747, 6993173781818645577597, 130018879726411743573963849, 5647047812461224621198055679517, 572953904651272394794692262471961499 (list; graph; listen)
OFFSET

1,2
CROSSREFS

Sequence in context: A124008 A033713 A067422 this_sequence A113564 A157387 A119291

Adjacent sequences: A145237 A145238 A145239 this_sequence A145241 A145242 A145243

KEYWORD

nonn

AUTHOR

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

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Last modified December 7 08:40 EST 2009. Contains 170430 sequences.

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