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develop an algorithm for calculating the fibonacci sequence.
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the fibonacci sequence can be calculated using a recursive algorithm, which is as follows: 

def fibonacci(n): 
  if n<=0: 
    return 0
  elif n==1: 
    return 1
  else: 
    return fibonacci(n-1)+fibonacci(n-2) 

this algorithm uses recursion to calculate the nth number of the fibonacci sequence. the algorithm begins by setting up two cases, one for n = 0 and the other for n = 1. if n = 0 or 1, the function simply returns the value of n.  if n is larger than 1, the function recursively calls itself twice, once for n-1 and once for n-2. the result of these recursive calls is added together to compute the fibonacci number for n.
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