a(n) = 1 + 2 * least i such that A103507(i)=n+1, 0 if no such i exists.

Terms

a(0) =9a(1) =15a(2) =31a(3) =101a(4) =139a(5) =227a(6) =91a(7) =503a(8) =995a(9) =451a(10) =751a(11) =539a(12) =1819a(13) =1397a(14) =2957a(15) =3461a(16) =1831a(17) =1417a(18) =6023a(19) =3769a(20) =1777a(21) =9587a(22) =5411a(23) =9421a(24) =18653a(25) =8089a(26) =4511a(27) =6541a(28) =10529a(29) =16051