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!)
A013511 tanh(sec(x)-sech(x))=2/2!*x^2-118/6!*x^6-29998/10!*x^10... 0

%I

%S 2,-118,-29998,611334362,-1141045350238,-231711278648170198,

%T 7649386255065750464882,1186434281262233535413422202,

%U -294894146013123744005989421634238,-35339306131583165000023092663749603638,51906656021441065578375756307601650588611602

%N tanh(sec(x)-sech(x))=2/2!*x^2-118/6!*x^6-29998/10!*x^10...

%t With[{nn=50},Take[CoefficientList[Series[Tanh[Sec[x]-Sech[x]],{x,0,nn}], x] Range[0,nn]!,{3,-1,4}]] (* _Harvey P. Dale_, Dec 29 2015 *)

%K sign

%O 0,1

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

%E More terms from _N. J. A. Sloane_, Dec 17 2011

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 October 28 16:09 EDT 2021. Contains 348329 sequences. (Running on oeis4.)