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- fibs = {0: 0, 1: 1}
- def fib(n):
- if n in fibs: return fibs[n]
- if n % 2 == 0:
- fibs[n] = ((2 * fib((n / 2) - 1)) + fib(n / 2)) * fib(n / 2)
- return fibs[n]
- else:
- fibs[n] = (fib((n - 1) / 2) ** 2) + (fib((n+1) / 2) ** 2)
- return fibs[n]
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