The multifactorial is a generalization of the double factorial, defining: * \(n!! = n \cdot(n - 2) \cdot(n - 4) \cdot(n - 6)\ldots\) * \(n!!! = n \cdot(n - 3) \cdot(n - 6) \cdot(n - 9)\ldots\) * \(n!!!! = n \cdot(n - 4) \cdot(n - 8) \cdot(n - 12)\ldots\) and so forth. For example, 10!!! = 10 · 7 · 4 · 1 = 280. It is important to note that multifactorials should not be interpreted as nested factorials, e.g. \(n!! < (n!)!\) and \(n!!! < ((n!)!)!\). Multifactorials actually grow slower than normal factorials, so much slower than iterated factorials.