A012653 Expansion of e.g.f. arctan(tanh(x) * log(x+1)).

0, 0, 2, -3, 0, -10, -80, 1764, -7392, 17856, -41792, -7382320, 134784320, -1068379104, 7660192384, 35293839840, -4466084847616, 93476460710912, -1176630882269184, 10358160914068992, 214589448557477888

Offset

0,3

Links

Table of n, a(n) for n=0..20.

Example

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

Crossrefs

Sequence in context: A012655 A012650 A111606 * A012656 A012397 A012402

Adjacent sequences: A012650 A012651 A012652 * A012654 A012655 A012656

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