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

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A012043 cosh(sin(arcsinh(x))) = 1+1/2!*x^2-7/4!*x^4+121/6!*x^6-4271/8!*x^8... 0

%I #9 Oct 30 2013 17:06:34

%S 1,1,-7,121,-4271,262801,-25257079,3510517193,-667413187039,

%T 166471455235489,-52750545434135399,20700581434214572441,

%U -9854557734715140280207,5594838313934367657655601

%N cosh(sin(arcsinh(x))) = 1+1/2!*x^2-7/4!*x^4+121/6!*x^6-4271/8!*x^8...

%F a(n) ~ (-1)^(n+1) * sin(sinh(Pi/2)) * cosh(Pi/2) * 2^(2*n) * n^(2*n-1) / exp(2*n). - _Vaclav Kotesovec_, Oct 30 2013

%t Table[n!*SeriesCoefficient[Cosh[Sin[ArcSinh[x]]],{x,0,n}],{n,0,40,2}] (* _Vaclav Kotesovec_, Oct 30 2013 *)

%K sign

%O 0,3

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

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 June 1 13:57 EDT 2023. Contains 363069 sequences. (Running on oeis4.)