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!)
A009355 Expansion of log(1+sinh(x))/cosh(x). 0

%I

%S 0,1,-1,0,-4,40,-181,896,-8464,88320,-863041,9382912,-120330244,

%T 1676579840,-24638823301,390142722048,-6678730634944,121851014348800,

%U -2353418855768161,48123147849826304,-1039698070255280164

%N Expansion of log(1+sinh(x))/cosh(x).

%F a(n) ~ (n-1)! * (-1)^(n+1) / (sqrt(2) * (log(1+sqrt(2)))^n). - _Vaclav Kotesovec_, Jan 23 2015

%t Log[ 1+Sinh[ x ] ]/Cosh[ x ]

%t CoefficientList[Series[Log[1 + Sinh[x]]*Sech[x], {x, 0, 20}], x] * Range[0, 20]! (* _Vaclav Kotesovec_, Jan 23 2015 *)

%K sign,easy

%O 0,5

%A _R. H. Hardin_

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

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 September 20 02:19 EDT 2021. Contains 347577 sequences. (Running on oeis4.)