a(2*n) = 9*2^n - 7, a(2*n+1) = 3*2^(n+2) - 7.

Terms

a(0) =2a(1) =5a(2) =11a(3) =17a(4) =29a(5) =41a(6) =65a(7) =89a(8) =137a(9) =185a(10) =281a(11) =377a(12) =569a(13) =761a(14) =1145a(15) =1529a(16) =2297a(17) =3065a(18) =4601a(19) =6137a(20) =9209a(21) =12281a(22) =18425a(23) =24569a(24) =36857a(25) =49145a(26) =73721a(27) =98297a(28) =147449a(29) =196601