Falling and rising factorials - Wikipedia

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How to prove the factorial of 1/2 is 0.5√π - Quora

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A frog jumps from the floor of an n-steps stair to the top of the stairs in k jumps, where k<=n.In how many different ways can the frog reach the top of

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How to determine all pairs (k, n) such that there exists a k-regular graph on n vertexes - Quora

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ラマヌジャンの円周率公式を理解したい第二回 - Holograph1c Attract0r

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There is a building with [math]n[/math] floors. A person can climb either 1 or 2 floors at a time. Find the number of ways to reach the nth floor? - Quora

How many ways are there to climb the eight-step ladder if you always step on either one or two steps at a time? - Quora

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How to determine all pairs (k, n) such that there exists a k-regular graph on n vertexes - Quora