[seqfan] Double Factorials

Henry Gould gould at math.wvu.edu
Thu Jan 29 23:54:17 CET 2009

Can anyone supply the name (and publication date_ of the originator(s) 
of the double factorial n!!
The notation is usually used when giving the formulas for Wallis' 
integral of powers of sine and cosine from 0 to pi. Also are there old 
expository papers giving this information?

Henry Gould

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