Plaindromes: numbers whose digits in base 9 are in nondecreasing order.

Terms

a(0) =0a(1) =1a(2) =2a(3) =3a(4) =4a(5) =5a(6) =6a(7) =7a(8) =8a(9) =10a(10) =11a(11) =12a(12) =13a(13) =14a(14) =15a(15) =16a(16) =17a(17) =20a(18) =21a(19) =22a(20) =23a(21) =24a(22) =25a(23) =26a(24) =30a(25) =31a(26) =32a(27) =33a(28) =34a(29) =35