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!)
A013477 Coefficient of [x^(4*n+2)] in expansion of e.g.f. tanh(cos(x) - cosh(x)). 0
-2, 238, -473762, 4544139598, -133366253033282, 9357776691549409198, -1341930712996828590536162, 352757692963898925496158362638, -156922931120424993062032606256707202, 111108598565238227067101723645812683396718 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

LINKS

Table of n, a(n) for n=0..9.

EXAMPLE

-2/2!*x^2 + 238/6!*x^6 - 473762/10!*x^10 + 4544139598/14!*x^14 ...

CROSSREFS

Sequence in context: A124046 A101146 A159280 * A013473 A212839 A225784

Adjacent sequences:  A013474 A013475 A013476 * A013478 A013479 A013480

KEYWORD

sign

AUTHOR

Patrick Demichel (patrick.demichel(AT)hp.com)

EXTENSIONS

Missing a(0)=-2 inserted, more terms, and title improved by Sean A. Irvine, Aug 07 2018

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 5 21:00 EDT 2020. Contains 335473 sequences. (Running on oeis4.)