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A145248
1/7 of the number of 7-colorings of an n X n array symmetric about main diagonal.
0
1, 36, 6696, 6434856, 31950305496, 819641876611536, 108639115329132446256, 74398000023802854152545176, 263238411131474343380724043084176, 4812272591214805875385097207664108389976
OFFSET
1,2
CROSSREFS
Sequence in context: A326999 A068272 A068284 * A222974 A013739 A203052
KEYWORD
nonn
AUTHOR
R. H. Hardin, Oct 05 2008
STATUS
approved