A121017 Stirling transform of A104600.

1, 1, 6, 65, 1125, 28132, 950649, 41475961, 2259756900, 149874308367, 11858161118925, 1101069785060610, 118366544943589215, 14564702419742606497, 2031425158227034739646, 318472106732688712103885, 55708816671530680003669185, 10803156636116962310987233404

Offset

0,3

Links

Alois P. Heinz, Table of n, a(n) for n = 0..273

Formula

a(n) = (1/(2e)) * Sum_{r,s >= 0} (r*s)^n / (2^r*s!).

a(n) = A000670(n)*A000110(n). - Vladeta Jovovic, Sep 27 2006

Maple

a:= n-> combinat[bell](n)*add(Stirling2(n, k)*k!, k=0..n): seq(a(n), n=0..19); # Zerinvary Lajos, Sep 30 2006

Crossrefs

Cf. A000110, A000670, A104600.

Row sums of A323099.

Sequence in context: A217899 A349524 A006959 * A239998 A278841 A327228

Adjacent sequences: A121014 A121015 A121016 * A121018 A121019 A121020

Keyword

easy,nonn

Author

Vladeta Jovovic, Sep 08 2006

Extensions

More terms from Zerinvary Lajos, Sep 30 2006

Status

approved