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A161024
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((2^b-1)/phi(n))*Sum_{d|n} Moebius(n/d)*d^(b-1) for b = 13.
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0
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8191, 33542145, 2176512520, 68694312960, 499938962796, 8912818769400, 18895663909200, 140685952942080, 385562663380440, 2047250052649620, 2570686683371352, 18253452839731200, 15902884603186140, 77377743708174000
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OFFSET
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1,1
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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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LINKS
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Table of n, a(n) for n=1..14.
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CROSSREFS
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Sequence in context: A075955 A075956 A022529 * A022195 A069388 A069414
Adjacent sequences: A161021 A161022 A161023 * A161025 A161026 A161027
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KEYWORD
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nonn
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AUTHOR
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N. J. A. Sloane, Nov 19 2009
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STATUS
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approved
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