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A161157 ((2^b-1)/phi(n))*Sum_{d|n} Moebius(n/d)*d^(b-1) for b = 15. 0
32767, 536821761, 78361756228, 4397643866112, 49998474112902, 1283800652283324, 3703889238001736, 36025498551189504, 124933950274693644, 819125001391673466, 1244326279702202508, 10516894943504990208 (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..12.

CROSSREFS

Sequence in context: A075961 A075962 A022531 * A069390 A069416 A289478

Adjacent sequences:  A161154 A161155 A161156 * A161158 A161159 A161160

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Nov 19 2009

STATUS

approved

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Last modified August 18 13:12 EDT 2019. Contains 326100 sequences. (Running on oeis4.)