This function calculates the double factorial of the specified number.

Syntax

FACTDOUBLE(number)

Arguments

The argument can be any non-negative numeric value.

Remarks

The number argument must be a non-negative number. If you provide a number that is not an integer for the number argument, the decimal portion of the number is ignored. The double factorial is calculated as follows for even numbers:

   n!! = n(n-2)(n-4) ... (4)(2)

The double factorial is calculated as follows for odd numbers:

   n!! = n(n-2)(n-4) ... (3)(1)

Data Types

Accepts numeric data. Returns numeric data.

Examples

Version Available

This function is available in product version 1.0 or later.

See Also

FACT | PRODUCT | Math and Trigonometry Functions