The OEIS mourns the passing of Jim Simons and is grateful to the Simons Foundation for its support of research in many branches of science, including the OEIS.
The OEIS is supported by the many generous donors to the OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A009186 Expansion of e.g.f.: cosh(x)/exp(tan(x)). 1
 1, -1, 2, -6, 16, -72, 328, -1848, 11712, -81088, 638720, -5318016, 49459840, -483162240, 5159926528, -57865303296, 697030680576, -8815813734400, 118233272496128, -1662921003208704, 24578235697610752, -380141599264751616, 6139851821419921408 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,3 LINKS Vincenzo Librandi, Table of n, a(n) for n = 0..200 MAPLE a:= n-> n! * coeff (series (cosh(x)/exp(tan(x)), x, n+1), x, n): seq (a(n), n=0..30); # Alois P. Heinz, May 16 2012 MATHEMATICA With[{nn=30}, CoefficientList[Series[Cosh[x]/Exp[Tan[x]], {x, 0, nn}], x] Range[0, nn]!] Harvey P. Dale, May 16 2012 CROSSREFS Sequence in context: A009386 A009605 A009681 * A009328 A009346 A009367 Adjacent sequences: A009183 A009184 A009185 * A009187 A009188 A009189 KEYWORD sign,easy AUTHOR R. H. Hardin EXTENSIONS Extended with signs by Olivier Gérard, Mar 15 1997 Definition clarified by Harvey P. Dale, May 16 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 May 29 14:24 EDT 2024. Contains 372952 sequences. (Running on oeis4.)