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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 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.)