A293122 E.g.f.: exp(-x^2/(1+x)).

1, 0, -2, 6, -12, 0, 240, -2520, 21840, -181440, 1481760, -11642400, 80498880, -311351040, -4739454720, 183437654400, -4300276780800, 88851284121600, -1754954007206400, 34107089784768000, -659574028252339200, 12724865943229440000, -244046146272658329600

Offset: 0

Author

Seiichi Manyama, Sep 30 2017

Keywords

• sign

Links

• Seiichi Manyama, Table of n, a(n) for n = 0..450

Crossrefs

Column k=1 of A293134.

Cf. A293117.

Programs

Mathematica

CoefficientList[Series[E^(-x^2/(1+x)), {x, 0, 20}], x] * Range[0, 20]! (* Vaclav Kotesovec, Sep 30 2017 *)

PARI

x='x+O('x^66); Vec(serlaplace(exp(-x^2/(1+x))))

Formula

a(n) = (-1)^n * A293117(n).