S(n) = n*5 + 4*4 = 5n + 16;
S(2) = 5*2 + 16 = 26;
S(3) = 5*3 + 16 = 31;
S(4) = 5*4 + 16 = 36;
S(5) = 5*5 + 16 = 41;
S(n) = n*5 + 4*4 = 5n + 16;
S(2) = 5*2 + 16 = 26;
S(3) = 5*3 + 16 = 31;
S(4) = 5*4 + 16 = 36;
S(5) = 5*5 + 16 = 41;