A145237 - OEIS

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A145237

1/3 of the number of 3-colorings of an n X n array symmetric about main diagonal.

1, 4, 24, 216, 2952, 61488, 1957392, 95392296, 7125411888, 816458567400, 143601085430064, 38787148664334000, 16094818374887017440, 10263152688155204724288, 10059484565080507620249504 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,2`
	CROSSREFS	`Sequence in context: A077555 A166881 A183279 * A034256 A179539 A074598` `Adjacent sequences: A145234 A145235 A145236 * A145238 A145239 A145240`
	KEYWORD	`nonn`
	AUTHOR	`R. H. Hardin (rhhardin(AT)att.net), Oct 05 2008`

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Last modified February 17 10:05 EST 2012. Contains 206009 sequences.