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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A012241 log(cos(arcsinh(x)))=-1/2!*x^2+2/4!*x^4-40/6!*x^6+1360/8!*x^8... 0
-1, 2, -40, 1360, -87680, 8723200, -1254323200, 245463296000, -62768582656000, 20318491009024000, -8121379360440320000, 3928322245164728320000, -2261534088991670272000000 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..12.

CROSSREFS

Sequence in context: A322179 A012834 A304448 * A286124 A275931 A099707

Adjacent sequences:  A012238 A012239 A012240 * A012242 A012243 A012244

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 October 17 14:47 EDT 2019. Contains 328114 sequences. (Running on oeis4.)