login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo

Thanks to everyone who made a donation during our annual appeal!
To see the list of donors, or make a donation, see the OEIS Foundation home page.

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A013150 sec(tanh(x)+arctan(x))=1+4/2!*x^2+48/4!*x^4+1344/6!*x^6+71680/8!*x^8... 0
1, 4, 48, 1344, 71680, 6134144, 766639104, 132845576192, 30189756186624, 8791995173601280, 3164834039610834944, 1391075516277863612416, 727593505575051704926208, 449845963881833812549697536 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

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

CROSSREFS

Sequence in context: A166231 A191952 A013145 * A011266 A197927 A100568

Adjacent sequences:  A013147 A013148 A013149 * A013151 A013152 A013153

KEYWORD

nonn

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 00:40 EST 2020. Contains 331030 sequences. (Running on oeis4.)