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A034765 Dirichlet convolution of sigma(n) with Bell numbers. 2
1, 4, 6, 15, 21, 74, 211, 914, 4161, 21216, 115987, 678800, 4213611, 27645078, 190899418, 1382961257, 10480142165, 82864882508, 682076806179, 5832742268693, 51724158236232, 474869816504724, 4506715738447347 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..23.

MATHEMATICA

Table[Sum[BellB[n/d - 1]*DivisorSigma[1, d], {d, Divisors[n]}], {n, 1, 30}] (* Vaclav Kotesovec, Sep 10 2019 *)

CROSSREFS

Sequence in context: A034764 A119034 A100911 * A300276 A109731 A027631

Adjacent sequences:  A034762 A034763 A034764 * A034766 A034767 A034768

KEYWORD

nonn,changed

AUTHOR

Erich Friedman

STATUS

approved

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Last modified September 19 04:52 EDT 2019. Contains 327187 sequences. (Running on oeis4.)