login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A208649 (1/n)*A073617(n+1). 2
1, 1, 1, 3, 6, 40, 150, 2100, 14700, 423360, 5556600, 325987200, 8068183200, 958961203200, 44996257706400, 10799101849536000, 965169727802280000, 466713183932835840000, 79775138681769651120000 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,4

LINKS

Table of n, a(n) for n=1..19.

MATHEMATICA

p[n_] := Product[Binomial[n + 1 - k, k],

{k, 1, Floor[(n + 1)/2]}]

Table[p[n], {n, 1, 20}]   (* A073617(n+1) *)

Table[p[n]/n, {n, 1, 20}] (* A208649 *)

CROSSREFS

Cf. A073617.

Sequence in context: A172361 A114038 A000222 * A203178 A104271 A109491

Adjacent sequences:  A208646 A208647 A208648 * A208650 A208651 A208652

KEYWORD

nonn

AUTHOR

Clark Kimberling, Feb 29 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 | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified April 5 20:21 EDT 2020. Contains 333260 sequences. (Running on oeis4.)