Numbers A001317 repeated.

Terms

a(0) =1a(1) =1a(2) =3a(3) =3a(4) =5a(5) =5a(6) =15a(7) =15a(8) =17a(9) =17a(10) =51a(11) =51a(12) =85a(13) =85a(14) =255a(15) =255a(16) =257a(17) =257a(18) =771a(19) =771a(20) =1285a(21) =1285a(22) =3855a(23) =3855a(24) =4369a(25) =4369a(26) =13107a(27) =13107a(28) =21845a(29) =21845