Nialpdromes: digits in base 15 are in nonincreasing 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) =15a(16) =16a(17) =30a(18) =31a(19) =32a(20) =45a(21) =46a(22) =47a(23) =48a(24) =60a(25) =61a(26) =62a(27) =63a(28) =64a(29) =75