For non-negative integers m, n, the Ackermann function A(m, n) is defined as follows:
For example A(1, 0) = 2, A(2, 2) = 7 and A(3, 4) = 125.
Find 
A(n, n) and give your answer mod 148.
For non-negative integers m, n, the Ackermann function A(m, n) is defined as follows:
For example A(1, 0) = 2, A(2, 2) = 7 and A(3, 4) = 125.
Find A(n, n) and give your answer mod 148.