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!)
A024230 Expansion of sin(x)*sin(sinh(x))/2. 0
0, 1, -2, -21, -4, 2677, 49978, 11487, -36275464, -1538399639, -22119645578, 2006421812307, 213180133008116, 10489769063373277, -27722182352718926, -68871270400638150585, -8464386105916692002320, -535985815068329924418863 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

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

MATHEMATICA

With[{nn=40}, Take[CoefficientList[Series[Sin[x]*Sin[Sinh[x]]/2, {x, 0, nn}], x] Range[0, nn]!, {1, -1, 2}]] (* Harvey P. Dale, Dec 05 2015 *)

CROSSREFS

Cf. A009547.

Sequence in context: A162536 A100980 A122509 * A105666 A058261 A298822

Adjacent sequences:  A024227 A024228 A024229 * A024231 A024232 A024233

KEYWORD

sign

AUTHOR

R. H. Hardin

EXTENSIONS

Extended with signs Mar 1997

Prior Mathematica program replaced by Harvey P. Dale, Dec 05 2015

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 October 30 03:24 EDT 2020. Contains 338076 sequences. (Running on oeis4.)