A086934 E.g.f.: (sqrt(Pi)/2)*erf(log(1-x)).

0, -1, -1, 0, 6, 34, 150, 548, 1064, -9620, -190980, -2379408, -26412408, -281137848, -2923819080, -29496805392, -277842087360, -2151448802448, -5085750338064, 334794720634752, 11987850975483360

Offset

0,5

Links

G. C. Greubel, Table of n, a(n) for n = 0..450

Formula

Sum_{k=0..floor((n-1)/2)} (-1)^(n-k)*Stirling1(n, 2*k+1)*(2*k)!/(k)!.

Mathematica

With[{nn=20}, CoefficientList[Series[Sqrt[Pi]/2 Erf[Log[1-x]], {x, 0, nn}], x] Range[0, nn]!] (* Harvey P. Dale, Mar 04 2015 *)

Crossrefs

Cf. A009199.

Sequence in context: A166812 A262844 A166941 * A009469 A222190 A304944

Adjacent sequences: A086931 A086932 A086933 * A086935 A086936 A086937

Keyword

sign

Author

Vladeta Jovovic, Sep 21 2003

Extensions

Definition clarified by Harvey P. Dale, Mar 04 2015

Status

approved