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!)
A012255 Expansion of e.g.f.: exp(tanh(arcsin(x)))=1+x+1/2!*x^2-3/4!*x^4-4/5!*x^5+21/6!*x^6... 0
1, 1, 1, 0, -3, -4, 21, 136, 185, 272, 9641, 222016, 1668021, 21267520, 192801597, 3836913536, 42064398961, 874251520256, 10576096455505, 254117293340672, 3476312353756781, 92635637659667456 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,5

LINKS

Table of n, a(n) for n=0..21.

MATHEMATICA

With[{nn=30}, CoefficientList[Series[Exp[Tanh[ArcSin[x]]], {x, 0, nn}], x] Range[0, nn]!] (* Harvey P. Dale, Sep 30 2019 *)

CROSSREFS

Sequence in context: A081698 A182096 A012123 * A012247 A057791 A167452

Adjacent sequences:  A012252 A012253 A012254 * A012256 A012257 A012258

KEYWORD

sign

AUTHOR

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

EXTENSIONS

Definition clarified by Harvey P. Dale, Sep 30 2019

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 May 29 07:41 EDT 2020. Contains 334697 sequences. (Running on oeis4.)