Return the 'hailstone sequence' from n to 1
     n: The starting point of the hailstone sequence

def hailstone(n):
  """Return the 'hailstone sequence' from n to 1
     n: The starting point of the hailstone sequence
  """

  sequence = [n]
  while n > 1:
    if n%2 != 0:
      n = 3*n + 1
    else: 
      n = int(n/2)
    sequence.append(n)
  return sequence