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!)
A009674 Expansion of tan(sin(x)/cosh(x)). 0
1, -2, -28, 1160, -3504, -3908896, 360691008, 14544047232, -11198480094976, 1531305962216960, 340347851378082816, -234547726326061201408, 32383387692585279868928, 30186184832886791121723392 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..13.

MATHEMATICA

With[{nn=30}, Take[CoefficientList[Series[Tan[Sin[x]/Cosh[x]], {x, 0, nn}], x] Range[0, nn-1]!, {2, -1, 2}]] (* Harvey P. Dale, Mar 06 2017 *)

CROSSREFS

Sequence in context: A113633 A186491 A300459 * A143598 A324077 A071220

Adjacent sequences:  A009671 A009672 A009673 * A009675 A009676 A009677

KEYWORD

sign

AUTHOR

R. H. Hardin

EXTENSIONS

Extended with signs by Olivier Gérard, Mar 15 1997

Prior Mathematica program replaced by Harvey P. Dale, Mar 06 2017

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 July 14 18:26 EDT 2020. Contains 335729 sequences. (Running on oeis4.)