Xenodromes: all digits in base 16 are different.

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) =15a(16) =16a(17) =18a(18) =19a(19) =20a(20) =21a(21) =22a(22) =23a(23) =24a(24) =25a(25) =26a(26) =27a(27) =28a(28) =29a(29) =30