Formula:8485

Digital Library of Mathematical Functions ID 26.4.E7

${\displaystyle{\displaystyle M_{2}=\frac{n!}{1^{a_{1}}(a_{1}!)\,2^{a_{2}}(a_{2}!)\,\cdots\,n^{a_{n}}(a_{n}!)}.}}$

Symbols List

• ${\displaystyle{\displaystyle!}}$:
• ${\displaystyle{\displaystyle n}}$: nonnegative integer
• ${\displaystyle{\displaystyle a_{n}}}$: nonnegative integers
• ${\displaystyle{\displaystyle M_{2}}}$: number of permutations
 

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