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"""Collatz sequence.

@author: Pablo Trinidad <github.com/pablotrinidad>

"""

def collatz(n):

"""Sequence generation."""

l = []

while n > 1:

l.append(n)

if n % 2 == 0:

n = n / 2

else:

n = (3 * n) + 1

l.append(n)

return l

n = int(input("Enter an integer n to compute the Collatz sequence: "))

print(collatz(n))