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!)
A013465 cos(arctan(x)-arctanh(x))=1-160/6!*x^6-691200/10!*x^10+3942400/12!*x^12... 0
1, 0, 0, -160, 0, -691200, 3942400, -14125363200, 295206912000, -902471385088000, 43911376404480000, -140627264197754880000, 12856220870209699840000, -45500991975079280640000000 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,4

LINKS

Table of n, a(n) for n=0..13.

MATHEMATICA

With[{nn=30}, Take[CoefficientList[Series[Cos[ArcTan[x]-ArcTanh[x]], {x, 0, nn}], x] Range[0, nn]!, {1, -1, 2}]] (* Ray Chandler, Nov 29 2016 *)

CROSSREFS

Sequence in context: A224430 A013454 A013455 * A013466 A060675 A171225

Adjacent sequences:  A013462 A013463 A013464 * A013466 A013467 A013468

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 | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified July 5 14:18 EDT 2022. Contains 355099 sequences. (Running on oeis4.)