Answer with Explanation

Given 1 = 5,
2 = 5*2 + (1) = 11
3 = 11*3 + (1 + 2) = 36
4 = 36*4 + (1 + 2 + 3) = 150
5 = 150*5 + (1 + 2 + 3 + 4) = 760

So answer to above number puzzle is 760