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!)
A024342 E.g.f. tanh(x)*tan(x), coefficients of powers x^(4*n+2). 2
2, 112, 92672, 365688832, 4411282030592, 127206964253949952, 7496936195881447718912, 809926025985929119868649472, 148071124873925782667263194693632, 43087047288444223765736160658186043392, 19011875896715283767147325248912471990730752 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

LINKS

Table of n, a(n) for n=0..10.

MATHEMATICA

With[{nn=40}, Take[CoefficientList[Series[Tanh[x]Tan[x], {x, 0, nn}], x] Range[0, nn-2]!, {3, -1, 4}]] (* Harvey P. Dale, May 02 2012 *)

CROSSREFS

Sequence in context: A173214 A024341 A012528 * A225333 A012525 A165975

Adjacent sequences:  A024339 A024340 A024341 * A024343 A024344 A024345

KEYWORD

nonn

AUTHOR

R. H. Hardin

EXTENSIONS

Extended and signs tested Mar 15 1997 by Olivier Gérard.

More terms from Harvey P. Dale, May 02 2012

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 April 3 22:48 EDT 2020. Contains 333207 sequences. (Running on oeis4.)