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Dec 18th, 2017
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Python 0.13 KB | None | 0 0
  1. def f(n):
  2.     if(n == 1):
  3.         return 1
  4.     elif (n == 2):
  5.         return 2
  6.     else: return 2*f(n-1)+f(n-2)
  7.  
  8. print(f(5))
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