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.
The OEIS is supported by the many generous donors to the OEIS Foundation.

 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 G. C. Greubel, Table of n, a(n) for n = 0..440 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 Adjacent sequences: A009594 A009595 A009596 * A009598 A009599 A009600 KEYWORD sign,easy 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.

Last modified May 28 01:12 EDT 2024. Contains 372900 sequences. (Running on oeis4.)