3^0 = 1 , 3^1 = 3, 3^2 = 9, 3^3 = 27
4^0 = 1, 4^1 = 4, 4^2 = 16, 4^3 = 64
2^0 = 0, (2^1)^1 = 2, (2^2)^2 = 2^4 = 16, (2^3)^3 = 2^9
(2+0)^0 = 1, (2+1)^1 = 3, (2+2)^2 = 16, (2+3)^3 = 5^3 = 125
