Katadromes: digits in base 14 are in strict descending order.

Terms

a(0) =0a(1) =1a(2) =2a(3) =3a(4) =4a(5) =5a(6) =6a(7) =7a(8) =8a(9) =9a(10) =10a(11) =11a(12) =12a(13) =13a(14) =14a(15) =28a(16) =29a(17) =42a(18) =43a(19) =44a(20) =56a(21) =57a(22) =58a(23) =59a(24) =70a(25) =71a(26) =72a(27) =73a(28) =74a(29) =84