Tower Of Hanoi - Math puzzle

Tower of Hanoi is logical puzzle game.
The objective of the puzzle is to move the entire stack from first rod on left to last thrid rod, obeying the following simple rules:
1 Only one disk can be moved at a time.
2 Each move consists of taking the upper disk from one of the stacks and placing it on top of another stack i.e. a disk can only be moved if it is the uppermost disk on a stack.
3 No disk may be placed on top of a smaller disk.