login
This site is supported by donations to The OEIS Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A009016 Expansion of E.g.f.: cos(cosh(x)*x) (even powers only). 7
1, -1, -11, -61, 1737, 88679, 2086525, -45950997, -9763133167, -705668046769, -17356978593659, 3823112141007763, 788728947108214489, 82036502117747569079, 1412038521698998808077 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

G. C. Greubel, Table of n, a(n) for n = 0..250

MATHEMATICA

With[{nmax = 60}, CoefficientList[Series[Cos[x*Cosh[x]], {x, 0, nmax}], x]*Range[0, nmax]!][[1 ;; -1 ;; 2]] (* G. C. Greubel, Jul 21 2018 *)

PROG

(PARI) x='x+O('x^60); v=Vec(serlaplace(cos(x*cosh(x)))); vector(#v\2, n, v[2*n-1]) \\ G. C. Greubel, Jul 21 2018

CROSSREFS

Sequence in context: A259257 A289646 A020454 * A191596 A227087 A052051

Adjacent sequences:  A009013 A009014 A009015 * A009017 A009018 A009019

KEYWORD

sign

AUTHOR

R. H. Hardin

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 | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified May 25 00:59 EDT 2019. Contains 323534 sequences. (Running on oeis4.)