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

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A012747 cosh(arctanh(x)*cos(x))=1+1/2!*x^2-3/4!*x^4+45/6!*x^6+2457/8!*x^8... 0
1, 1, -3, 45, 2457, 161625, 20549397, 3457938757, 772773915313, 221864504883633, 79479234590193325, 34768359140993612893, 18241340561609524790601, 11306811847252896133698825 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

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

CROSSREFS

Sequence in context: A163002 A117253 A012833 * A210933 A027637 A228903

Adjacent sequences:  A012744 A012745 A012746 * A012748 A012749 A012750

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 January 19 20:22 EST 2022. Contains 350466 sequences. (Running on oeis4.)