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A145242 1/4 of the number of 4-colorings of an n X n array symmetric under 180 degree rotation. 0
1, 3, 51, 813, 75351, 6514173, 3287790591, 1547899100553, 4259466117807411, 10935733441872804453, 164161963716080866194651 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
LINKS
CROSSREFS
Sequence in context: A045489 A232453 A248341 * A182512 A075869 A361051
KEYWORD
nonn
AUTHOR
R. H. Hardin, Oct 05 2008
STATUS
approved

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Last modified March 3 00:25 EST 2024. Contains 370499 sequences. (Running on oeis4.)