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A047940 Number of 5-colorings of an n X n grid, up to rotational symmetry. 0
1, 5, 165, 489125, 38147070625, 74505806274453125, 3637978807092666626953125, 4440892098500626236200333251953125, 135525271560688054250937420874834136962890625 (list; graph; refs; listen; history; internal format)
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 = 5

CROSSREFS

Cf. A054752, A047937-A047945.

Sequence in context: A197095 A203185 A129995 * A157234 A206393 A198711

Adjacent sequences:  A047937 A047938 A047939 * A047941 A047942 A047943

KEYWORD

nonn

AUTHOR

Robert W. Pratt (Rob.Pratt(AT)sas.com)

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Last modified February 14 20:38 EST 2012. Contains 205663 sequences.