id:A145242 - OEIS Search Results

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1/4 of the number of 4-colorings of an n X n array symmetric under 180 degree rotation.

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1, 3, 51, 813, 75351, 6514173, 3287790591, 1547899100553, 4259466117807411, 10935733441872804453, 164161963716080866194651 (list; graph; listen)

	OFFSET	`1,2`
	CROSSREFS	`Sequence in context: A144987 A062216 A045489 this_sequence A075869 A126685 A105639` `Adjacent sequences: A145239 A145240 A145241 this_sequence A145243 A145244 A145245`
	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.