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A047941 Number of 6-colorings of an n X n grid, up to rotational symmetry. 3
1, 6, 336, 2521476, 705277897416, 7107572010747738816, 2578606199622659276537193216, 33678386561031835867238388699701784576, 15835071665743319426540573726368249140484891508736, 268034865369025581797148715934176748584236925114472848300179456 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Andrew Howroyd, Table of n, a(n) for n = 0..25

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 = 6.

CROSSREFS

Column k=6 of A343095.

Cf. A047937.

Sequence in context: A003031 A144849 A212490 * A229501 A289738 A211089

Adjacent sequences:  A047938 A047939 A047940 * A047942 A047943 A047944

KEYWORD

nonn

AUTHOR

Rob Pratt

EXTENSIONS

Terms a(9) and beyond from Andrew Howroyd, Apr 14 2021

STATUS

approved

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Last modified December 7 22:50 EST 2021. Contains 349590 sequences. (Running on oeis4.)