Documentation/How Tos/Calc: FACTDOUBLE function
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FACTDOUBLE
Returns the double factorial of a number.
Syntax:
FACTDOUBLE(number)
- returns number!!, the double factorial of number, where number is an integer greater than or equal to zero.
- For even numbers FACTDOUBLE(number) returns:
- 2*4*6*8* ... *number
- For odd numbers FACTDOUBLE(number) returns:
- 1*3*5*7* ... *number
- FACTDOUBLE(0) returns 1 by definition.
Example:
FACTDOUBLE(5)
- returns 15.
FACTDOUBLE(6)
- returns 48.
FACTDOUBLE(0)
- returns 1.
