Double factor online calculator

Description: Enter numbers using a comma (,) or a space or a tab or a separate line.

The double-stage multiplication "m!!" is indicated. When m is a natural number, it represents the product of all positive integers that do not exceed m and have the same parity as m.

Example:

3!!=1 * 3=3

5!!=1 * 3 * 5=15

6!!=2 * 4 * 6=48

8!!=2 * 4 * 6 * 8=384

另0!!=1!!=1

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