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

 

Logo

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 56th year, we are closing in on 350,000 sequences, and we’ve crossed 9,700 citations (which often say “discovered thanks to the OEIS”).

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A012030 arctan(sin(sinh(x))) = x - 2/3!*x^3 +16/5!*x^5 - 440/7!*x^7 + 20224/9!*x^9 - .... 0
1, -2, 16, -440, 20224, -1582976, 178612864, -27969867008, 5765737517056, -1516228355846144, 495092243779256320, -196552136456231321600, 93232152295610535018496, -52074797114273752377786368 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

a(n) appears to be divisible by 2^n, with the factor 1, -1, 4, -55, 1264, -49468, 2790826, -218514586, 22522412176,.... - Ralf Stephan, Aug 14 2013

LINKS

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

CROSSREFS

Sequence in context: A009397 A229023 A009700 * A012682 A012678 A012146

Adjacent sequences:  A012027 A012028 A012029 * A012031 A012032 A012033

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 December 5 06:12 EST 2021. Contains 349532 sequences. (Running on oeis4.)