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A047938
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Number of ways to label points of an n X n grid with 3 colors, up to rotational symmetry.
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5
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1, 3, 24, 4995, 10763361, 211822552035, 37523658921114744, 59824832307866205347043, 858420955073128584419531008641, 110856622060759442496180656754310346403, 128844380183002832759115461915902241562318377784, 1347757724935823407809884872163997148505019182125807296675
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OFFSET
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0,2
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COMMENTS
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Labels of adjacent points need not be distinct.
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LINKS
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FORMULA
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a(n) = (m^(n^2) + 2 m^((n^2 + 3 (n mod 2))/4) + m^((n^2 + (n mod 2))/2))/4, with m = 3.
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CROSSREFS
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See A068253 for number of proper colorings.
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KEYWORD
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nonn
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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