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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 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..10.

CROSSREFS

Sequence in context: A326999 A068272 A068284 * A222974 A013739 A203052

Adjacent sequences:  A145245 A145246 A145247 * A145249 A145250 A145251

KEYWORD

nonn

AUTHOR

R. H. Hardin, Oct 05 2008

STATUS

approved

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Last modified November 21 14:18 EST 2019. Contains 329371 sequences. (Running on oeis4.)