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Double factorial

Writing functions:

factorialdbl(x)

Unlike factorial, where the product of the numbers from 1 to the indicated number, then double factorial is a multiplication of numbers from 1 (or 2) to indicated number from step 2. The number x is always finite, for example:

factorialdbl(7)=1*3*5*7

factorialdbl(12)=2*4*6*10*12

 

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