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A160960 Sum_{d|n} Moebius(n/d)*d^(b-1)/phi(n) for b = 12. 8
1, 2047, 88573, 2096128, 12207031, 181308931, 329554457, 2146435072, 5230147077, 24987792457, 28531167061, 185660345344, 149346699503, 674597973479, 1081213356763, 2197949513728, 2141993519227, 10706111066619 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

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..18.

FORMULA

a(n) = J_11(n)/J_1(n) where J_11 and J_1(n)=A000010(n) are Jordan functions. - R. J. Mathar, Jul 12 2011

CROSSREFS

Sequence in context: A180065 A075954 A011561 * A038998 A068027 A075949

Adjacent sequences:  A160957 A160958 A160959 * A160961 A160962 A160963

KEYWORD

nonn,mult

AUTHOR

N. J. A. Sloane, Nov 19 2009

EXTENSIONS

Definition corrected by Enrique Pérez Herrero, Oct 30 2010

STATUS

approved

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Last modified April 18 11:35 EDT 2014. Contains 240707 sequences.