Double factorial

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Calculates the double factorial x!!.

x 
    3. real number
x!! 
    1.  
    Double factorial
    [1-7] /7Disp-Num
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    [1]  2020/04/09 18:50   Male / 20 years old level / High-school/ University/ Grad student / Useful /
    Purpose of use
    checking my code
    Comment/Request
    Code still bad, this on the other hand, pretty damn good.
    [2]  2020/01/09 14:57   Female / Under 20 years old / Elementary school/ Junior high-school student / Very /
    Purpose of use
    curiosity
    [3]  2019/05/13 01:04   Male / Under 20 years old / Elementary school/ Junior high-school student / Very /
    Purpose of use
    To check
    Comment/Request
    Very good.
    [4]  2018/03/07 05:11   Male / Under 20 years old / Elementary school/ Junior high-school student / Useful /
    Purpose of use
    educational
    [5]  2018/01/03 19:33   Male / 20 years old level / High-school/ University/ Grad student / Very /
    Purpose of use
    educational
    [6]  2017/11/07 23:18   Male / Under 20 years old / High-school/ University/ Grad student / Very /
    Purpose of use
    Discovery
    [7]  2014/11/03 10:45   Male / 20 years old level / High-school/ University/ Grad student / Very /
    Purpose of use
    refresher
    Comment/Request
    n/a

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