\begin{align*} f(1) = \amp f(0) + 1 = \amp 0 + 1 = 1\\ f(2) = \amp f(1) + 3 = \amp 1 + 3 = 4\\ f(3) = \amp f(2) + 5 = \amp 4 + 5 = 9\\ f(4) = \amp f(3) + 7 = \amp 9 + 7 = 16\\ f(5) = \amp f(4) + 9 = \amp 16 + 9 = 25\\ f(6) = \amp f(5) + 11 = \amp 25 + 11 = 36 \end{align*}