A093002 Product of factorials of next n numbers.

1, 2, 144, 2073600, 17557585920000, 192668014586363904000000, 5116462645455544976110780416000000000

Offset: 1

Author

Amarnath Murthy, Mar 29 2004

Keywords

• nonn

Comments

Essentially the same as A074319. [From R. J. Mathar, Sep 08 2008]

Examples

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

Programs

PARI

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

Extensions

Corrected and extended by Mohammed Bouayoun (bouyao(AT)wanadoo.fr), Mar 29 2004