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!)
A013102 E.g.f: sech(arcsinh(x)+tan(x))=1-4/2!*x^2+72/4!*x^4-3414/6!*x^6... 1
1, -4, 72, -3414, 304696, -43757114, 9229955724, -2685455642198, 1030584093889104, -504321546504212914, 306492028524272596724, -226465717137080425353646, 199935485865217931345463224 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,2
LINKS
MATHEMATICA
With[{nn=30}, Take[CoefficientList[Series[Sech[ArcSinh[x]+Tan[x]], {x, 0, nn}], x]Range[0, nn]!, {1, -1, 2}]] Harvey P. Dale, May 17 2012
CROSSREFS
Sequence in context: A012947 A203535 A013066 * A224900 A012995 A076744
KEYWORD
sign
AUTHOR
Patrick Demichel (patrick.demichel(AT)hp.com)
EXTENSIONS
Definition clarified by Harvey P. Dale, May 17 2012
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 February 29 11:28 EST 2024. Contains 370425 sequences. (Running on oeis4.)