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Central binomial coefficient
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Central binomial coefficient : ウィキペディア英語版
Central binomial coefficient

In mathematics the ''n''th central binomial coefficient is defined in terms of the binomial coefficient by
: = \frac\textn \geq 0.
They are called central since they show up exactly in the middle of the even-numbered rows in Pascal's triangle. The first few central binomial coefficients starting at ''n'' = 0 are:
:, , , , , , 924, 3432, 12870, 48620, …
== Properties ==
These numbers have the generating function
:\frac \sim \fracn\rightarrow\infty.
The latter can also be easily established by means of Stirling's formula. On the other hand, it can also be used as a means to determine the constant \sqrt in front of the Stirling formula, by comparison.
Simple bounds are given by
:\frac \leq \leq 4^n\textn \geq 1
Some better bounds are
:\frac \leq \fracn \geq 1
and, if more accuracy is required,
: = \frac\right)\text\frac < c_n < \frac for all n \geq 1.
The only central binomial coefficient that is odd is 1.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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