login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A012218 tanh(arctan(arcsinh(x)))=x-5/3!*x^3+129/5!*x^5-7741/7!*x^7... 0
1, -5, 129, -7741, 830529, -139115349, 33466193409, -10924199283981, 4643317555286145, -2490727724722757925, 1645111995753399461505, -1311624218654589461390685, 1241813393715548870981284545 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..12.

CROSSREFS

Sequence in context: A277259 A230303 A094074 * A012136 A012022 A012176

Adjacent sequences:  A012215 A012216 A012217 * A012219 A012220 A012221

KEYWORD

sign

AUTHOR

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

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 July 11 01:46 EDT 2020. Contains 335600 sequences. (Running on oeis4.)