A034765 Dirichlet convolution of sigma(n) with Bell numbers.

1, 4, 6, 15, 21, 74, 211, 914, 4161, 21216, 115987, 678800, 4213611, 27645078, 190899418, 1382961257, 10480142165, 82864882508, 682076806179, 5832742268693, 51724158236232, 474869816504724, 4506715738447347

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: A119034 A100911 A346297 * A300276 A109731 A369437

Adjacent sequences: A034762 A034763 A034764 * A034766 A034767 A034768

Keyword

nonn

Author

Erich Friedman

Status

approved