the answer is (1+n)^2 but I can't figure out why

An investment fund is started with an initial deposit of 1 at time 0. New deposits are made continuously at the annual rate 1+t at time t over the next n years. The force of interest at t is given by 8(t) = 17. Find the accumulated value in the fund at the end of n years. Hint: (1+n)