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A141004
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E.g.f. exp(sum_{d|M} (exp(d*x)-1)/d), M=6.
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6
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1, 4, 28, 258, 2892, 37778, 560124, 9256010, 168182044, 3325057826, 70934634236, 1621828212826, 39517131361884, 1021237022557682, 27877344103738940, 800976143703407210, 24148078430008534428
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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, 6], {n, 0, 12}] [From Wouter Meeussen, Dec 06 2008]
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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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