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This tag is used if a reference is needed in a paper or textbook on a specific result.

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Eulerian number identity

The Eulerian number $A(n,m)$ is defined as the number of permutations $\sigma \in S_n$ having precisely $m$ descents, i.e. indices $i$ such that $\sigma(i)>\sigma(i+1)$. The wikipedia entry on these …