Metadromes: digits in base 8 are in strict ascending order.

Terms

a(0) =0a(1) =1a(2) =2a(3) =3a(4) =4a(5) =5a(6) =6a(7) =7a(8) =10a(9) =11a(10) =12a(11) =13a(12) =14a(13) =15a(14) =19a(15) =20a(16) =21a(17) =22a(18) =23a(19) =28a(20) =29a(21) =30a(22) =31a(23) =37a(24) =38a(25) =39a(26) =46a(27) =47a(28) =55a(29) =83