19 in base 19-n.

Terms

a(0) =10a(1) =11a(2) =12a(3) =13a(4) =14a(5) =15a(6) =16a(7) =17a(8) =18a(9) =19a(10) =21a(11) =23a(12) =25a(13) =31a(14) =34a(15) =103a(16) =201a(17) =10011