A039938 with duplicates removed.

Terms

a(0) =7a(1) =37a(2) =237a(3) =1789a(4) =4357a(5) =14379a(6) =19587a(7) =93957a(8) =189572a(9) =189597a(10) =1234397a(11) =1839597a(12) =1958798a(13) =1983957a(14) =3978594a(15) =11983957a(16) =19596487a(17) =29195397a(18) =39599197a(19) =195991487a(20) =339799143a(21) =395991697a(22) =1429199397a(23) =1679895983a(24) =1983994799a(25) =2239951987a(26) =11959939917a(27) =15991995897