a(n) = 1 + 2 * least i such that A103509(i)=n+1, 0 if no such i exists.

Terms

a(0) =9a(1) =11a(2) =21a(3) =57a(4) =23a(5) =55a(6) =245a(7) =241a(8) =115a(9) =833a(10) =83a(11) =523a(12) =437a(13) =193a(14) =447a(15) =733a(16) =167a(17) =689a(18) =1417a(19) =611a(20) =2297a(21) =1081a(22) =2731a(23) =1283a(24) =2755a(25) =5057a(26) =2761a(27) =887a(28) =2719a(29) =9221