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A093002 Product of factorials of next n numbers. 1

%I #4 Dec 05 2013 19:56:46

%S 1,2,144,2073600,17557585920000,192668014586363904000000,

%T 5116462645455544976110780416000000000

%N Product of factorials of next n numbers.

%C Essentially the same as A074319. [From _R. J. Mathar_, Sep 08 2008]

%e a(1)=2!=2, a(2)=3!*4!=144, a(3)=4!*5!*6!, a(4)=5!*6!*7!*8!.

%o (PARI) a(n)=prod(i=n+1,2*n,i!)

%K nonn

%O 1,2

%A _Amarnath Murthy_, Mar 29 2004

%E Corrected and extended by Mohammed Bouayoun (bouyao(AT), Mar 29 2004

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Last modified May 20 02:09 EDT 2024. Contains 372703 sequences. (Running on oeis4.)