A208649 - OEIS

A208649

(1/n)*A073617(n+1).

1, 1, 1, 3, 6, 40, 150, 2100, 14700, 423360, 5556600, 325987200, 8068183200, 958961203200, 44996257706400, 10799101849536000, 965169727802280000, 466713183932835840000, 79775138681769651120000

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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: A114038 A000222 A372017 * A371063 A203178 A104271

Adjacent sequences: A208646 A208647 A208648 * A208650 A208651 A208652

KEYWORD

nonn

AUTHOR

Clark Kimberling, Feb 29 2012

STATUS

approved