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!)
A009363 Expansion of log(1+tan(log(1+x))). 0
0, 1, -2, 9, -55, 434, -4180, 47590, -625770, 9339880, -156097760, 2889491800, -58706203400, 1299203207600, -31115627649600, 801958361812400, -22134642846706000, 651438145653776000, -20365743882600064000 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,3
LINKS
FORMULA
a(n) ~ (n-1)! * (-1)^(n+1) / (1-exp(-Pi/4))^n. - Vaclav Kotesovec, Jan 23 2015
MATHEMATICA
With[{nn=20}, CoefficientList[Series[Log[1+Tan[Log[1+x]]], {x, 0, nn}], x]Range[0, nn]!] (* Harvey P. Dale, Sep 28 2011 *)
CROSSREFS
Sequence in context: A355281 A036074 A231172 * A069564 A109366 A303914
KEYWORD
sign,easy
AUTHOR
EXTENSIONS
Extended with signs by Olivier Gérard, Mar 15 1997
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 March 29 06:44 EDT 2024. Contains 371265 sequences. (Running on oeis4.)