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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; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..8.

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: A203185 A129995 A259613 * A229414 A210923 A229524

Adjacent sequences:  A047937 A047938 A047939 * A047941 A047942 A047943

KEYWORD

nonn

AUTHOR

Rob Pratt

STATUS

approved

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Last modified September 20 03:32 EDT 2019. Contains 327209 sequences. (Running on oeis4.)