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A141011
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E.g.f. exp(sum_{d|M} (exp(d*x)-1)/d), M=15.
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2
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1, 4, 40, 612, 11976, 276836, 7336248, 219610532, 7331824360, 269576919908, 10796426089880, 466904884431268, 21658080409800264, 1071807203930733668, 56328256034260866296, 3131089417758323092388
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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, 15], {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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