On Aug 26, 9:37 pm, Robert Bradshaw <[EMAIL PROTECTED]>
wrote:
> On Tue, 26 Aug 2008, William Stein wrote:
>
> > On Tue, Aug 26, 2008 at 5:34 PM, Jason Merrill <[EMAIL PROTECTED]> wrote:

> >> Does Sage have a double factorial somewhere that I'm missing.  If not,
> >> could it?
>
> Yes, Integers have a (highly optimized) multifactorial method.
>
> sage: a = 20
>
> sage: a.multifactorial(2)
>   3715891200
>
> - Robert

Perfect.  Thanks.

JM
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