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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A205825 a(n) = n!/ceiling(n/2)!. 2
1, 1, 2, 3, 12, 20, 120, 210, 1680, 3024, 30240, 55440, 665280, 1235520, 17297280, 32432400, 518918400, 980179200, 17643225600, 33522128640, 670442572800, 1279935820800, 28158588057600, 53970627110400, 1295295050649600, 2490952020480000, 64764752532480000 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

Table of n, a(n) for n=0..26.

FORMULA

E.g.f.: (exp(x^2)*(x+1) -1)/x. - Sergei N. Gladkovskii, Oct 10 2012

MATHEMATICA

Table[n!/Ceiling[n/2]!, {n, 1, 24}]

CROSSREFS

Cf. A205785, A205786.

Sequence in context: A067391 A096361 A105045 * A076000 A096632 A124261

Adjacent sequences:  A205822 A205823 A205824 * A205826 A205827 A205828

KEYWORD

nonn

AUTHOR

Clark Kimberling, Feb 01 2012

EXTENSIONS

a(0)=1 prepended and e.g.f. edited by Alois P. Heinz, Sep 08 2015

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 September 15 12:44 EDT 2019. Contains 327078 sequences. (Running on oeis4.)