input: from typing import List
  
  
  def fibonacci_sequence(n: int) -> List[int]:
      """ Generate a list of the first n numbers in the Fibonacci sequence.
      >>> fibonacci_sequence(0)
      [0]
      >>> fibonacci_sequence(1)
      [0, 1]
      >>> fibonacci_sequence(5)
      [0, 1, 1, 2, 3]
      >>> fibonacci_sequence(9)
      [0, 1, 1, 2, 3, 5, 8, 13, 21]
      """
      if n < 0:
          return []
      sequence = [0, 1]
      for i in range(2, n):
          sequence.append(sequence[-1] + sequence[-2])
      return sequence[:n]
output:     if n == 0:
          return [0]
      elif n == 1:
          return [0, 1]