The OEIS is supported by the many generous donors to the OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A009603 Expansion of sinh(tan(tan(x))) (odd powers only). 1

%I #15 Jan 31 2018 03:18:43

%S 1,5,113,5669,494081,65835109,12394430129,3124415825605,

%T 1014225530028161,411568350375102789,203968457810172592497,

%U 121149200509578256609253,84912250115184457330480001

%N Expansion of sinh(tan(tan(x))) (odd powers only).

%H G. C. Greubel, <a href="/A009603/b009603.txt">Table of n, a(n) for n = 0..222</a>

%t With[{nn=30},Take[CoefficientList[Series[Sinh[Tan[Tan[x]]],{x,0,nn}],x] Range[0,nn-1]!,{2,-1,2}]] (* _Harvey P. Dale_, Sep 02 2015 *)

%o (PARI) x='x+O('x^30); Vec(serlaplace(sinh(tan(tan(x))))) \\ _G. C. Greubel_, Jan 30 2018

%K nonn

%O 0,2

%A _R. H. Hardin_

%E Extended and signs tested by _Olivier GĂ©rard_, Mar 15 1997

%E Prior Mathematica program replaced by _Harvey P. Dale_, Sep 02 2015

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified April 12 07:56 EDT 2024. Contains 371626 sequences. (Running on oeis4.)