Created
March 4, 2016 12:46
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| fibonacci :: Integer -> Integer | |
| fibonacci n | n < 0 = ((-1) ^ (-n+1)) * fibonacci(-n) | |
| | n == 0 = 0 | |
| | n == 1 = 1 | |
| | n > 0 = fibonacci(n - 1) + fibonacci(n - 2) |
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