[seqfan] Gosper's notes on higher factorials

[Robert Munafo]

What is the date (year of authorship) of these ancient (mostly) POX notes?

I want to add this as a reference for OEIS sequence A2109:

https://oeis.org/A002109

It would also be nice to add a sequence for the (Gosper's) second
factorial with integer arguments, which I take to be 1, 1, 16,
122009559759792, 16358..68032 (169 digits, approx. 1.63588 x 10 ^ 168)
but I don't like to add sequences without a reference.

- Robert

On 5/7/12, Bill Gosper <billgosper at gmail.com> wrote:
> By way of preservation, Neil has kindly scanned in my ancient,
> (mostly) POX (pre-Tex), brief notes <http://gosper.org/facfun.pdf>
> (3.7M) on higher factorials.
> These stem from my astounding discovery that the dot at the
> bottom of an exclamation point is actually hollow, representing
> the number 0, and what happens when you change it to a 1.
> --rwg

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