Created
February 7, 2012 03:01
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Bell numbers
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| (defn bell | |
| "Returns the nth Bell number" | |
| [n] | |
| (cond | |
| (= n 0) 1 | |
| (= n 1) 1 | |
| :else (reduce + (map #(abs (stirling-2 n %)) (range 0 (inc n)))))) |
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