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A145259
1/9 of the number of 9-colorings of an n X n array symmetric about both diagonal and antidiagonal.
0
1, 8, 512, 29184, 13307904, 5404672512, 17559792635904, 50811763602977280, 1176249454737889112064, 24250990871047073899451904, 3999906334177619217671691141120
OFFSET
1,2
CROSSREFS
Sequence in context: A236220 A128794 A195804 * A154025 A013713 A109966
KEYWORD
nonn
AUTHOR
R. H. Hardin, Oct 05 2008
STATUS
approved