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A034770
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Dirichlet convolution of Bell numbers with themselves.
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0
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1, 2, 4, 11, 30, 108, 406, 1764, 8284, 42324, 231950, 1357264, 8427194, 55289280, 381798704, 2765918869, 20960284294, 165729748096, 1364153612318, 11665484452558, 103448316471556, 949739632545452, 9013431476894646
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OFFSET
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1,2
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LINKS
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MATHEMATICA
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Table[Sum[BellB[n/d - 1]*BellB[d - 1], {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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