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A145250
1/7 of the number of 7-colorings of an n X n array symmetric under 180 degree rotation.
0
1, 6, 966, 153996, 661773786, 2815356109536, 322956657504465996, 36676462296254099505756
OFFSET
1,2
CROSSREFS
Sequence in context: A263423 A266598 A250392 * A332196 A375020 A024085
KEYWORD
nonn
AUTHOR
R. H. Hardin, Oct 05 2008
STATUS
approved