Double Factorial Table

The double factorial is the product of a number and every second natural number less than itself. That is:

\(n!! = \prod_{k = 0}^{ \lceil n/2 \rceil - 1} (n - 2k) = n(n-2)(n-4)...\)

Presentation of the values for double factorials is usually split up into separate even- and odd- sequences. Instead, I wanted to see the sequence all together, as below:

Values of the double factorial function

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