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A034764
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Dirichlet convolution of sigma(n) with Catalan numbers.
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0
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1, 4, 6, 15, 20, 64, 140, 466, 1451, 4928, 16808, 58986, 208026, 743328, 2674532, 9696213, 35357688, 129649324, 477638720, 1767277964, 6564120996, 24466317456, 91482563664, 343059792196, 1289904147439, 4861947025544
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OFFSET
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1,2
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LINKS
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FORMULA
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MATHEMATICA
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Table[Sum[CatalanNumber[n/d - 1]*DivisorSigma[1, d], {d, Divisors[n]}], {n, 1, 25}] (* Vaclav Kotesovec, Sep 10 2019 *)
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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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