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A160896 ((2^b-1)/phi(n))*Sum_{d|n} Moebius(n/d)*d^(b-1) for b = 6. 0
63, 1953, 7623, 31248, 49203, 236313, 176463, 499968, 617463, 1525293, 1014615, 3781008, 1949283, 5470353, 5953563, 7999488, 5590683, 19141353, 8666343, 24404688, 21352023, 31453065, 18431343, 60496128, 30751875, 60427773 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

REFERENCES

J. H. Kwak and J. Lee, Enumeration of graph coverings, surface branched coverings and related group theory, in Combinatorial and Computational Mathematics (Pohang, 2000), ed. S. Hong et al., World Scientific, Singapore 2001, pp. 97-161. See p. 134.

LINKS

Table of n, a(n) for n=1..26.

FORMULA

a(n) = 63*A160893(n). - R. J. Mathar, Mar 16 2016

CROSSREFS

Sequence in context: A107319 A243214 A005463 * A017779 A110826 A017726

Adjacent sequences:  A160893 A160894 A160895 * A160897 A160898 A160899

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Nov 19 2009

STATUS

approved

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Last modified August 10 04:38 EDT 2020. Contains 336368 sequences. (Running on oeis4.)