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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
1, 3, 51, 813, 75351, 6514173, 3287790591, 1547899100553, 4259466117807411, 10935733441872804453, 164161963716080866194651
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Maintained by
N. J. A. Sloane
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njas@research.att.com
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Last modified December 1 19:22 EST 2009. Contains 167811 sequences.
AT&T Labs Research
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