[Jolly]

What exactly do we need to print, if anything?

Anyways, here's a straightforward Python solution (46 Bytes).

Code:

n=input() while n>1:n=[n/2,3*n+1][n%2];print n

You're lucky Stuck has no while-loops ;P

As someone learning Python, that line of code makes me cry internally, although it is correct and effective. Although I'm confused on how it functions without any if-statements or loops. (Python 3 user)