> (power 2 8)
|(power 2 8)
| (power 2 7)
| |(power 2 6)
| | (power 2 5)
| | |(power 2 4)
| | | (power 2 3)
| | | |(power 2 2)
| | | | (power 2 1)
| | | | |(power 2 0)
| | | | |1
| | | | 2
| | | |4
| | | 8
| | |16
| | 32
| |64
| 128
|256
256