input: def Fibonacci_sequence(n: int):
      """Generate and display the Fibonacci sequence of the first n numbers.
      >>> for i in range(1, 10):
      ...     print(Fibonacci_sequence(i))
      0
      1
      1
      2
      3
      5
      8
      13
      21
      """
      if n == 1:
          return 0
      elif n == 2:
          return 1
      else:
          return Fibonacci_sequence(n - 1) + Fibonacci_sequence(n - 2)
output:     if n == 1:
          return 0
      elif n == 2:
          return 1
      else:
          a, b = 0, 1
          for _ in range(2, n):
              a, b = b, a + b
          return b