The Collatz-O-Matic

Are you sick of having to work out the Collatz Sequence by hand? Run out of whiteboard space? Hand cramping up with all your scribbling? Then you need my latest project, the Collatz-O-Matic! This came about because after the previous posts on Cellular Automata, I sent a link to Stephen Wolfram, he kindly emailed back and said he thought it was cool. However the email ended with: (emphasis mine)”