a(0)=7; a(n) = 7*a(n-1) + 1 if a(n-1) is odd, a(n) = a(n-1)/2 otherwise.

Terms

a(0) =7a(1) =50a(2) =25a(3) =176a(4) =88a(5) =44a(6) =22a(7) =11a(8) =78a(9) =39a(10) =274a(11) =137a(12) =960a(13) =480a(14) =240a(15) =120a(16) =60a(17) =30a(18) =15a(19) =106a(20) =53a(21) =372a(22) =186a(23) =93a(24) =652a(25) =326a(26) =163a(27) =1142a(28) =571a(29) =3998