Double factorial
product of all the integers from 1 up to the integral input of the function that have the same parity as this input
Double factorial is a method of calculating how many times a number is repeated in a geometric equation. This way, we can calculate the number of times a product is used in its life-time.
The double factorial of n is written as .[1] When n is a positive odd integer, is defined as . When n is an positive even integer, is defined as . By definition, .[2][3]
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