Math exponential number conversion

Hi
I just realized i forgot all about math…
I need to make a function that would output values like this:
1 = 0.125
12 = 0.25
24 = 0.5
36 = 1
48 = 2
60 = 4
72 = 8

So if you were to feed it with 1, you would get 0.125 - and if you fed it 6 you would get a value between 0.125 and 0.25, and so on, all values exponential.

oh, I figured it out…
float ValueConverter(int _initial) { float multiplier = (Mathf.Pow((float)2, (float)_initial/12)); return 0.125f*multiplier; }