A013248 Expansion of e.g.f. tan(log(x+1) - arctan(x)).

0, 0, -1, 4, -6, 0, -150, 2280, -16520, 96320, -1045800, 17316000, -244530000, 3061344000, -43372529200, 761044648000, -14257920144000, 263995016064000, -5068873669392000, 106427464573248000

Offset

0,4

Links

Table of n, a(n) for n=0..19.

Example

-1/2!*x^2 + 4/3!*x^3 - 6/4!*x^4 - 150/6!*x^6 ...

Crossrefs

Sequence in context: A013252 A013251 A013247 * A013254 A094920 A010668

Adjacent sequences: A013245 A013246 A013247 * A013249 A013250 A013251

Keyword

sign

Author

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

Extensions

a(0)=a(1)=0 inserted and title improved by Sean A. Irvine, Aug 02 2018

Status

approved