input: from typing import List
  
  def Fibonacci_sequence(n: int) -> List[int]:
      """ Generate a Fibonacci sequence of the first n numbers.
      >>> Fibonacci_sequence(1)
      [0]
      >>> Fibonacci_sequence(2)
      [0, 1]
      >>> Fibonacci_sequence(5)
      [0, 1, 1, 2, 3]
      """
      if n == 1:
          return [0]
      elif n == 2:
          return [0, 1]
      else:
          seq = [0, 1]
          for i in range(2, n):
              seq.append(seq[-1] + seq[-2])
          return seq
output:     if n == 1:
          return [0]
      elif n == 2:
          return [0, 1]
      else:
          seq = [0, 1]
          for i in range(2, n):
              seq.append(seq[-1] + seq[-2])
          return seq