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Copyright (C) 2000-2012 Philippe Troin <webmaster@fifi.org>.
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FACTDOUBLE(number)
FACTDOUBLE function returns the double factorial of a @number, i.e., x!!.
If @number is not an integer, it is truncated. If @number is negative FACTDOUBLE returns #NUM! error.
This function is Excel compatible.
FACTDOUBLE(5) equals 15.
FACT.