login
The OEIS is supported by
the many generous donors to the OEIS Foundation
.
Hints
(Greetings from
The On-Line Encyclopedia of Integer Sequences
!)
A012811
cosh(sec(x)*arctan(x))=1+1/2!*x^2+5/4!*x^4+205/6!*x^6+2473/8!*x^8...
0
1, 1, 5, 205, 2473, 475385, -2814227, 5900398725, -532397600303, 273302104270705, -68724093821987755, 35776180280496600509, -16339748046588020242311, 10552119508350355540652905
(
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:
A157389
A128678
A232987
*
A186722
A060486
A002438
Adjacent sequences:
A012808
A012809
A012810
*
A012812
A012813
A012814
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
|
Recents
The OEIS Community
| Maintained by
The OEIS Foundation Inc.
License Agreements, Terms of Use, Privacy Policy.
.
Last modified April 19 18:05 EDT 2024. Contains 371798 sequences. (Running on oeis4.)