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@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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