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A216629 a(n) = A163085(n)/(floor(n/2)!)^2. 1
1, 1, 2, 12, 18, 540, 1200, 168000, 735000, 463050000, 4667544000, 12938431968000, 332086420512000, 3989022083190144000, 279394363051195392000, 14383221809875538780160000, 2892376010829659126572800000, 632822947409421120302862912000000 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

Table of n, a(n) for n=0..17.

PROG

(Sage)

def A216629(n): return A163085(n)/factorial(n//2)^2

[A216629(n) for n in (0..17)]

CROSSREFS

Cf. A069651.

Sequence in context: A115109 A048001 A109299 * A259409 A073257 A240905

Adjacent sequences:  A216626 A216627 A216628 * A216630 A216631 A216632

KEYWORD

nonn

AUTHOR

Peter Luschny, Sep 18 2012

STATUS

approved

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Last modified January 23 16:48 EST 2020. Contains 331173 sequences. (Running on oeis4.)