
#41





#42




I don't think I'd ever heard of a "double factorial" before today.
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#43




"parity", as in odd/even? Never heard that term before.
I'd heard of semifactorial, but haven't heard of double factorial refering to the same thing. (Must be the same thing as people using semiannual and biannual to mean twice a year) 
#44




That is interesting  I always thought that it was just the factorial of the factorial (e.g., 3!!=720). Having used an 8digit calculator back in high school, I enjoyed how high I could get a factorial before I got an error. For single factorials it was 69!, and for what I thought was a double factorial it was 4!!. That's why I always liked the number 2!!!!!!!!!
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#45




Don't forget Tromey integers too!

#46




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(3!)!=720 Has the factorial of a factorial ever been used in legitimate mathematics? p.s. Here's a nice little article from Wolfram MathWorld on the double factorial  http://mathworld.wolfram.com/DoubleFactorial.html
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#48




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#49




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#50




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