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A047944 Number of 9-colorings of an n X n grid, up to rotational symmetry. 1
1, 9, 1665, 96870249, 463255057977921, 179474496923598616041129, 5632099886234793640483695986653185, 14316042242555870306568544190208626253583093449 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..7.

FORMULA

a(n) = (m^(n^2) + 2 m^((n^2 + 3 (n mod 2))/4) + m^((n^2 + (n mod 2))/2))/4, with m = 9

CROSSREFS

Cf. A047937-A047945.

Sequence in context: A167774 A197206 A197804 * A322245 A251700 A246115

Adjacent sequences:  A047941 A047942 A047943 * A047945 A047946 A047947

KEYWORD

nonn

AUTHOR

Rob Pratt

STATUS

approved

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Last modified September 19 23:31 EDT 2019. Contains 327207 sequences. (Running on oeis4.)