Created
March 24, 2016 18:03
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| # Yes, I cheated, after getting the formula wrong. | |
| f = [1] | |
| def fac(n): | |
| if n >= len(f): | |
| f.append(fac(n-1) * n) | |
| return f[n] | |
| n = 20 | |
| print fac(n*2) / (fac(n)*fac(n)) |
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