a(n) is the first occurrence of n in sequence A209266.

Terms

a(0) =3a(1) =5a(2) =9a(3) =14a(4) =16a(5) =26a(6) =54a(7) =67a(8) =74a(9) =103a(10) =161a(11) =293a(12) =236a(13) =432a(14) =249a(15) =788a(16) =1078a(17) =796a(18) =1885a(19) =2091a(20) =1712a(21) =2618a(22) =4099a(23) =7088a(24) =8137a(25) =8091a(26) =16086a(27) =12595a(28) =27627a(29) =22835