(4-6-4) (6-12-8) (8-12-6) (12-30-20)
What is the next number triplet - and why?
I'll add hints if nobody gets the answer first. In the past I've used this riddle in a game with my RPG gaming group.
Edit: The answer I'm seeking in this riddle is unique and well defined. It requires thinking out of the box a bit. I will add hints over time. One, actually, has already been given.