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!)
A012968 arctanh(arctan(x)+log(x+1))=2*x-1/2!*x^2+16/3!*x^3-54/4!*x^4+876/5!*x^5... 0
0, 2, -1, 16, -54, 876, -6630, 122904, -1558536, 33455520, -601095600, 14941817856, -346714064928, 9916498091808, -280431880000272, 9142107223322304, -303483440198252160, 11161636493381966592 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..17.

MATHEMATICA

With[{nn=30}, CoefficientList[Series[ArcTanh[ArcTan[x]+Log[x+1]], {x, 0, nn}], x] Range[0, nn]!] (* Ray Chandler, Nov 28 2016 *)

CROSSREFS

Sequence in context: A013121 A012963 A013120 * A266827 A316226 A160468

Adjacent sequences:  A012965 A012966 A012967 * A012969 A012970 A012971

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 2 08:50 EDT 2020. Contains 335398 sequences. (Running on oeis4.)