Answer: 237
Solution:
11 + (1^3 + 1) = 11 + 2 = 13
13 + (2^3 - 1) = 13 + 7 = 20
20 + (3^3 + 1) = 20 + 28 = 48
48 + (4^3 - 1) = 48 + 63 = 111
111 + (5^3 + 1) = 111 + 126 = 237