A Langford-like sequence.

Terms

a(0) =5a(1) =6a(2) =7a(3) =8a(4) =9a(5) =15a(6) =16a(7) =17a(8) =18a(9) =29a(10) =42a(11) =63a(12) =74a(13) =83a(14) =161a(15) =273a(16) =286a(17) =300a(18) =400a(19) =684a(20) =900a(21) =1315a(22) =1319a(23) =1513a(24) =1813a(25) =1913a(26) =2582a(27) =3005a(28) =3006a(29) =3007