Fibonacci Sequence. Look it up on Google. 0, 1, 1, 2, 3, 5, 8, 13, ect.....
And yes, it does apply in real mathematics, and is used in the design of coasters, buildings, bridges, and many other marvels of human engineering. I'm very interested to see if it applies to Knex coasters however, because the track and trains in no way behave like real coasters, mostly due to friction (or in some situations, the lack thereof due to the not-to-scale mass of the trains).
I'll follow this though, and I'd really like to see some pics of that Kingda Ka model.