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Search: id:A160972
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| A160972 |
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Sum_{d|n} Moebius(n/d)*d^(b-1)/phi(n) for b = 12. |
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+0
1
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| 1, 4095, 265720, 8386560, 61035156, 1088123400, 2306881200, 17175674880, 47071500840, 249938963820, 313842837672, 2228476723200, 1941507093540, 9446678514000, 16218261652320, 35175782154240, 36413889826860
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OFFSET
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1,2
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REFERENCES
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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.
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CROSSREFS
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Adjacent sequences: A160969 A160970 A160971 this_sequence A160973 A160974 A160975
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KEYWORD
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nonn,new
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com), Nov 19 2009
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