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!)
A012199 tanh(arctan(arcsin(x)))=x-3/3!*x^3+49/5!*x^5-1691/7!*x^7+108961/9!*x^9... 1
1, -3, 49, -1691, 108961, -10415699, 1476822801, -274051642731, 68034310337345, -20698489943585315, 7945165226724184305, -3587174193714146380475, 1968139895275233488888545, -1234522114580149082237390195, 916981332590411294370399470545 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Harvey P. Dale, Table of n, a(n) for n = 0..100

MATHEMATICA

With[{nn=30}, Take[CoefficientList[Series[Tanh[ArcTan[ArcSin[x]]], {x, 0, nn}], x] Range[0, nn-1]!, {2, -1, 2}]] (* Harvey P. Dale, Oct 13 2014 *)

CROSSREFS

Sequence in context: A303248 A187664 A336673 * A337154 A300990 A062961

Adjacent sequences:  A012196 A012197 A012198 * A012200 A012201 A012202

KEYWORD

sign

AUTHOR

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

EXTENSIONS

More terms from Harvey P. Dale, Oct 13 2014

STATUS

approved

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

License Agreements, Terms of Use, Privacy Policy. .

Last modified January 21 22:08 EST 2022. Contains 350480 sequences. (Running on oeis4.)