Nialpdromes: digits in base 11 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) =22a(14) =23a(15) =24a(16) =33a(17) =34a(18) =35a(19) =36a(20) =44a(21) =45a(22) =46a(23) =47a(24) =48a(25) =55a(26) =56a(27) =57a(28) =58a(29) =59