The OEIS mourns the passing of Jim Simons and is grateful to the Simons Foundation for its support of research in many branches of science, including the OEIS.
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!)
A009597 Expansion of sinh(sinh(log(1+x))). 1
0, 1, -1, 4, -18, 106, -750, 6196, -58408, 617716, -7234020, 92842696, -1294948776, 19493497024, -314874396928, 5430592728016, -99578626460160, 1934092698170896, -39660351268817808, 856128235903319296 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,4
LINKS
FORMULA
a(n) ~ n! * (-1)^(n+1) * exp(1/4 + sqrt(2*n)) / (2^(9/4) * n^(3/4) * sqrt(Pi)). - Vaclav Kotesovec, Jan 24 2015
MATHEMATICA
Sinh[ Sinh[ Log[ 1+x ] ] ]
CoefficientList[Series[Sinh[(x*(2 + x))/(2*(1 + x))], {x, 0, 20}], x] * Range[0, 20]! (* Vaclav Kotesovec, Jan 24 2015 *)
PROG
(PARI) x='x+O('x^50); concat([0], Vec(serlaplace(sinh(sinh(log(1+x)))))) \\ G. C. Greubel, Apr 11 2017
CROSSREFS
Sequence in context: A321278 A020114 A354015 * A241841 A241842 A306003
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 May 28 01:12 EDT 2024. Contains 372900 sequences. (Running on oeis4.)