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A047939 Number of 4-colorings of an n X n grid, up to rotational symmetry. 0
1, 4, 70, 65824, 1073758336, 281474993496064, 1180591620734591303680, 79228162514264619068554215424, 85070591730234615870455337878516924416, 1461501637330902918203686041642102636484130504704 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..9.

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 = 4

CROSSREFS

Cf. A054751, A047937-A047945.

Sequence in context: A136465 A184576 A162135 * A088693 A322397 A262235

Adjacent sequences:  A047936 A047937 A047938 * A047940 A047941 A047942

KEYWORD

nonn

AUTHOR

Rob Pratt

STATUS

approved

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Last modified October 23 23:51 EDT 2019. Contains 328379 sequences. (Running on oeis4.)