A012656 Expansion of e.g.f. tanh(tanh(x) * log(x+1)).

0, 0, 2, -3, 0, -10, -80, 1764, -7392, 17856, -283712, -729520, 54950720, -376487904, 2292269824, -55214177760, 28440387584, 13225268890112, -126040313401344, 1502866020183552, -50075653378957312, 223574694389975040, 11796635075419975680, -128448524174854445056

Offset

0,3

Links

Vincenzo Librandi, Table of n, a(n) for n = 0..200

Example

(2/2!)*x^2 - (3/3!)*x^3 - (10/5!)*x^5 - (80/6!)*x^6 ...

Mathematica

With[{nn=30}, Drop[CoefficientList[Series[Tanh[Tanh[x]Log[x+1]], {x, 0, nn}], x] Range[0, nn]!]] (* Harvey P. Dale, Oct 26 2011 *)

Crossrefs

Sequence in context: A012650 A111606 A012653 * A012397 A012402 A177700

Adjacent sequences: A012653 A012654 A012655 * A012657 A012658 A012659

Keyword

sign

Author

Patrick Demichel (patrick.demichel(AT)hp.com)

Extensions

a(0) and a(1) inserted and title improved by Sean A. Irvine, Jul 23 2018

Status

approved