f(1) = 4 is given
f(2) = 2f(2-1)+3
= 2f(1)+3
= 24+3
= 8+3
= 11
f(3) = 2f(3-1)+3
= 2f(2)+3
= 211+3
= 22+3
= 25
f(4) = 2f(4-1)+3
= 2f(3)+3
= 225+3
= 50+3
= 53
f(5) = 2f(5-1)+3
= 2f(4)+3
= 253+3
= 106+3
= 109
f(1) = 4
f(2) = 11
f(3) = 25
f(4) = 53
f(5) = 109
