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!)
A009617 Expansion of tanh(tan(x))*sin(x)/2. 0
1, 116, 202576, 1557978176, 34206677698816, 1706222428480541696, 167325183704890858786816, 29168516299952885066683006976, 8389219957754997383106354075467776 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..8.

MATHEMATICA

Sinh[ Tanh[ x ]*Tan[ x ] ]/2 (* [ x^(4n+2) ] *)

CROSSREFS

Cf. A012671.

Sequence in context: A296360 A035814 A284377 * A201728 A009687 A050660

Adjacent sequences:  A009614 A009615 A009616 * A009618 A009619 A009620

KEYWORD

nonn

AUTHOR

R. H. Hardin

EXTENSIONS

Extended and signs tested 03/97.

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 January 25 14:40 EST 2022. Contains 350572 sequences. (Running on oeis4.)