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

1,2

LINKS

Table of n, a(n) for n=1..8.

CROSSREFS

Sequence in context: A263423 A266598 A250392 * A332196 A024085 A080474

Adjacent sequences: A145247 A145248 A145249 * A145251 A145252 A145253

KEYWORD

nonn

AUTHOR

R. H. Hardin, Oct 05 2008

STATUS

approved

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Last modified March 28 17:37 EDT 2023. Contains 361596 sequences. (Running on oeis4.)