The OEIS is supported by the many generous donors to the OEIS Foundation.

 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 60th year, we have over 367,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”). Other ways to Give
 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A013091 E.g.f.: exp(arcsinh(x)+tan(x)) = 1 + 2*x + 4/2!*x^2 + 9/3!*x^3 + 24/4!*x^4 + 97/5!*x^5 + .... 0
 1, 2, 4, 9, 24, 97, 534, 2975, 16520, 114217, 1017914, 8693355, 66612612, 641356549, 8612481206, 99659748575, 839464647792, 10015783072433, 223263066398386, 3322983000373651, 20349154329810172 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 LINKS Table of n, a(n) for n=0..20. FORMULA E.g.f.: (x+sqrt(1+x^2))*exp(tan(x)). - Vaclav Kotesovec, Nov 01 2013 a(n) ~ -2 * n^(n-1) * cos(Pi*n/2-tanh(1)) / exp(n). - Vaclav Kotesovec, Nov 01 2013 MATHEMATICA With[{nn=30}, CoefficientList[Series[Exp[ArcSinh[x]+Tan[x]], {x, 0, nn}], x] Range[0, nn]!] (* Harvey P. Dale, Sep 19 2012 *) CROSSREFS Sequence in context: A097656 A324148 A012936 * A013168 A013183 A049963 Adjacent sequences: A013088 A013089 A013090 * A013092 A013093 A013094 KEYWORD sign AUTHOR Patrick Demichel (patrick.demichel(AT)hp.com) EXTENSIONS Definition clarified by Harvey P. Dale, Sep 19 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.

Last modified December 8 13:09 EST 2023. Contains 367679 sequences. (Running on oeis4.)