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!)
A009547 Expansion of e.g.f. sin(x)*sin(sinh(x)) (even powers only). 2
0, 2, -4, -42, -8, 5354, 99956, 22974, -72550928, -3076799278, -44239291156, 4012843624614, 426360266016232, 20979538126746554, -55444364705437852, -137742540801276301170, -16928772211833384004640 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,2
LINKS
MATHEMATICA
With[{nmax = 50}, CoefficientList[Series[Sin[x]*Sin[Sinh[x]], {x, 0, nmax}], x]*Range[0, nmax]!][[1 ;; ;; 2]] (* G. C. Greubel, Jan 20 2018 *)
PROG
(PARI) x='x+O('x^50); v=Vec(serlaplace(sin(x)*sin(sinh(x)))); concat([0], vector(#v\2, n, v[2*n-1])) \\ G. C. Greubel, Jan 20 2018
CROSSREFS
Sequence in context: A184245 A103105 A018312 * A215921 A009811 A364237
KEYWORD
sign
AUTHOR
EXTENSIONS
Extended with signs by Olivier Gérard, Mar 15 1997
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 July 15 00:37 EDT 2024. Contains 374323 sequences. (Running on oeis4.)