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 []
      sequence = [0]
      if n == 1:
          return sequence
      sequence.append(1)
      for i in range(2, n):
          sequence.append(sequence[-1] + sequence[-2])
      return sequence
output:     if n < 1:
          return []
      sequence = [0]
      if n == 1:
          return sequence
      sequence.append(1)
      for i in range(2, n):
          sequence.append(sequence[-1] + sequence[-2])
      return sequence