Katadromes: digits in base 12 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) =24a(14) =25a(15) =36a(16) =37a(17) =38a(18) =48a(19) =49a(20) =50a(21) =51a(22) =60a(23) =61a(24) =62a(25) =63a(26) =64a(27) =72a(28) =73a(29) =74