Shifted Pell recurrence: a(n) = 2*a(n-2) + a(n-4).

Terms

a(0) =1a(1) =3a(2) =5a(3) =7a(4) =11a(5) =17a(6) =27a(7) =41a(8) =65a(9) =99a(10) =157a(11) =239a(12) =379a(13) =577a(14) =915a(15) =1393a(16) =2209a(17) =3363a(18) =5333a(19) =8119a(20) =12875a(21) =19601a(22) =31083a(23) =47321a(24) =75041a(25) =114243a(26) =181165a(27) =275807a(28) =437371a(29) =665857