Numbers in ascending order formed by using all the digits of the next n numbers.

Terms

a(0) =1a(1) =23a(2) =32a(3) =456a(4) =465a(5) =546a(6) =564a(7) =645a(8) =654a(9) =10789a(10) =10798a(11) =10879a(12) =10897a(13) =10978a(14) =10987a(15) =17089a(16) =17098a(17) =17809a(18) =17890a(19) =17908a(20) =17980a(21) =18079a(22) =18097a(23) =18709a(24) =18790a(25) =18907a(26) =18970a(27) =19078a(28) =19087a(29) =19708