Factorial

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Neil Sloane and Simon Plouffe defined the superfactorial in 1995 as the product of the first n factorials. So the superfactorial of 4 is 1! x 2! x 3! x 4! = 288.

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This idea was extended in 2000 by Henry Bottomley to the superduperfactorial as the product of the first n superfactorials [...]


http://en.wikipedia.org/wiki/Factorial