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Search: id:A145239
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A145239 1/3 of the number of 3-colorings of an n X n array symmetric under 180 degree rotation. +0
1
1, 2, 10, 44, 510, 5224, 141884, 3412572, 218142282, 12364138164, 1864646386404, 249526282773960, 88904892606631308, 28120381445675195736, 23690799052839367018340 (list; graph; listen)
OFFSET

1,2
CROSSREFS

Sequence in context: A144896 A142983 A065805 this_sequence A068561 A068484 A005963

Adjacent sequences: A145236 A145237 A145238 this_sequence A145240 A145241 A145242

KEYWORD

nonn

AUTHOR

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

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.

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