id:A047944 - OEIS Search Results

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Number of 9-colorings of an n X n grid, up to rotational symmetry.

+0
2

1, 9, 1665, 96870249, 463255057977921, 179474496923598616041129, 5632099886234793640483695986653185, 14316042242555870306568544190208626253583093449 (list; graph; listen)

	OFFSET	`0,2`
	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: A117053 A120347 A167774 this_sequence A068182 A114224 A024125` `Adjacent sequences: A047941 A047942 A047943 this_sequence A047945 A047946 A047947`
	KEYWORD	`nonn`
	AUTHOR	`Robert W. Pratt (Rob.Pratt(AT)sas.com)`

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Last modified December 16 17:18 EST 2009. Contains 170825 sequences.

AT&T Labs Research