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!)
A012050 sech(sin(tanh(x)))=1-1/2!*x^2+17/4!*x^4-673/6!*x^6+48481/8!*x^8... 0
1, -1, 17, -673, 48481, -5556929, 930399601, -214412110305, 65104843008449, -25194079035190657, 12104203127776694225, -7069126951831617433377, 4932323527151866597114145, -4052159085639349626953573441 (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: A089018 A118769 A009158 * A012157 A012137 A171198

Adjacent sequences:  A012047 A012048 A012049 * A012051 A012052 A012053

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 July 26 02:06 EDT 2021. Contains 346294 sequences. (Running on oeis4.)