using System;
var power2 = new PowerOfTwo();
var p2 = power2[2];
//p2 is 4
var p8 = power2[8];
//p8 is 256
var p16 = power2[16];
//p16 is 65536
Console.WriteLine("{0}, {1}, {2}", p2, p8, p16);
class PowerOfTwo {
public int this[int i] => (int) Math.Pow(2, i);
}