login
This site is supported by donations to The OEIS Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A012242 log(cos(tanh(x)))=-1/2!*x^2+6/4!*x^4-72/6!*x^6+1456/8!*x^8... 0
-1, 6, -72, 1456, -47104, 2390784, -180612096, 18625189888, -2431403622400, 384624656646144, -72343735465672704, 16067422146130345984, -4193787904779561730048, 1276366494840535652499456 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..13.

MATHEMATICA

With[{nn=30}, Take[CoefficientList[Series[Log[Cos[Tanh[x]]], {x, 0, nn}], x] Range[0, nn]!, {3, -1, 2}]] (* Harvey P. Dale, May 27 2014 *)

CROSSREFS

Sequence in context: A052730 A010796 A038095 * A138446 A099029 A120331

Adjacent sequences:  A012239 A012240 A012241 * A012243 A012244 A012245

KEYWORD

sign

AUTHOR

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

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 August 25 13:50 EDT 2019. Contains 326324 sequences. (Running on oeis4.)