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Factorial


	The factorial of 4, which is written as , is . Similarly, . The number grows very quickly as increases. The double factorial of a number , which is written as , is an extension to the normal factorial. When is odd, . When is even, .


	Contributed by: Ed Pegg Jr Additional Contributions by: Rob Morris

Factorial (Wolfram MathWorld)

Double Factorial (Wolfram MathWorld)

"Factorial" from The Wolfram Demonstrations Project
http://demonstrations.wolfram.com/Factorial/

Contributed by: Ed Pegg Jr

Additional Contributions by: Rob Morris

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