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$F(n) = \frac{\sum_{r=1}^{n} \sum_{\lceil \frac{n}{r} \rceil}^{n - r + 1} \frac{r}{k}(\sum_{i=1}^r \frac{n^i}{i!})}{B(n)}$ where $B(n)is the $n$th Bell number.
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Sat, 30 Dec 2017 07:45 GMT