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A141006
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E.g.f. exp(sum_{d|M} (exp(d*x)-1)/d), M=9.
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2
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1, 3, 22, 235, 3139, 49376, 891491, 18160071, 411124024, 10212362573, 275543711899, 8012352809874, 249516568317597, 8277748828228015, 291219448755079278, 10821916875914147551, 423314732431005599479
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OFFSET
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0,2
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LINKS
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MATHEMATICA
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u[0, j_]: = 1; u[k_, j_]: = u[k, j] = Sum[Binomial[k-1, i-1]Plus@@(u[k-i, j]#^(i-1)&/@Divisors[j]), {i, k}]; Table[u[n, 9], {n, 0, 30}](* Vincenzo Librandi, Dec 12 2012 *)
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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