FACTDOUBLE function

FACTDOUBLE returns the double factorial of a number.

Syntax

FACTDOUBLE(number)

number is an integer that is greater than or equal to zero.
Note:
  • For even numbers, FACTDOUBLE(n) returns 2*4*6*8* ... *n.
  • For odd numbers, FACTDOUBLE(n) returns 1*3*5*7* ... *n.
  • =FACTDOUBLE(0) returns 1 by definition.

Example

  • =FACTDOUBLE(5) returns 15.
  • =FACTDOUBLE(6) returns 48.
  • =FACTDOUBLE(0) returns 1.