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Dynamic programming: another approach

Superfactorial!!

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Suppose we invented a new number function – the superfactorial. It is denoted as $n!!$ , and is defined as: $n!! = n * n * (n-1) * (n-1) * (n-2) * (n-2) * ... * 2 * 2 * 1 * 1$ . What is the superfactorial of number $15$ ?

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