please help

\fList the first five terms of the sequence. an a1 = 2, an+1 = 1 + an a1 = az a3 = a4 as =Find a formula for the general term a, of the sequence, assuming that the pattern of the first few terms continues. (Assume that n begins with 1.) 1 - 5, 10, 20 40 80 9 27 81 an