Metadromes: digits in base 6 are in strict ascending order.

Terms

a(0) =0a(1) =1a(2) =2a(3) =3a(4) =4a(5) =5a(6) =8a(7) =9a(8) =10a(9) =11a(10) =15a(11) =16a(12) =17a(13) =22a(14) =23a(15) =29a(16) =51a(17) =52a(18) =53a(19) =58a(20) =59a(21) =65a(22) =94a(23) =95a(24) =101a(25) =137a(26) =310a(27) =311a(28) =317a(29) =353