Created
March 25, 2016 22:56
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stirling number of the second kind
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| def stirling_second(x,n): | |
| if n <= 1 or x == n: return 1 | |
| if n > x or x <= 0: return 0 | |
| return stirling_second(x-1, n-1) + n * stirling_second(x-1, n) |
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