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A145260
1/9 of the number of 9-colorings of an n X n array symmetric under 180 degree rotation.
0
1, 8, 3256, 1319648, 27265229496, 560946752022448
OFFSET
1,2
CROSSREFS
Sequence in context: A217270 A137565 A281323 * A201100 A079177 A298279
KEYWORD
nonn
AUTHOR
R. H. Hardin, Oct 05 2008
STATUS
approved