login
The OEIS is supported by
the many generous donors to the OEIS Foundation
.
Hints
(Greetings from
The On-Line Encyclopedia of Integer Sequences
!)
A009718
Expansion of tan(tanh(x))*x.
1
0, 2, 0, -48, 896, -1280, -1317888, 113985536, -5662048256, -173996310528, 103038851481600, -18151624725757952, 1834297840675848192, 53334014587534573568, -66117477689491873333248
(
list
;
graph
;
refs
;
listen
;
history
;
text
;
internal format
)
OFFSET
0,2
LINKS
Table of n, a(n) for n=0..14.
MATHEMATICA
Tan[ Tanh[ x ] ]*x (* Even Part *)
CROSSREFS
Sequence in context:
A326718
A097173
A009493
*
A198799
A156501
A012420
Adjacent sequences:
A009715
A009716
A009717
*
A009719
A009720
A009721
KEYWORD
sign
AUTHOR
R. H. Hardin
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 April 19 21:09 EDT 2024. Contains 371798 sequences. (Running on oeis4.)