login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A012652 Expansion of e.g.f.: tan(tanh(x) * log(x+1)). 0
0, 0, 2, -3, 0, -10, 400, -3276, 12768, -72864, 1933888, -32108560, 322393280, -3122225184, 60417280768, -1349906937120, 23068109840384, -351887538631168, 6985288388898816, -174933529672527360 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

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

EXAMPLE

2/2!*x^2 - 3/3!*x^3 - 10/5!*x^5 + 400/6!*x^6 ...

MATHEMATICA

With[{nn=20}, CoefficientList[Series[Tan[Tanh[x]Log[x+1]], {x, 0, nn}], x] Range[0, nn]!] (* Harvey P. Dale, Jun 19 2022 *)

CROSSREFS

Sequence in context: A012651 A012401 A012398 * A012404 A002099 A265514

Adjacent sequences: A012649 A012650 A012651 * A012653 A012654 A012655

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

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified January 31 13:56 EST 2023. Contains 359971 sequences. (Running on oeis4.)