Plaindromes: numbers whose digits in base 5 are in nondecreasing order.

Terms

a(0) =0a(1) =1a(2) =2a(3) =3a(4) =4a(5) =6a(6) =7a(7) =8a(8) =9a(9) =12a(10) =13a(11) =14a(12) =18a(13) =19a(14) =24a(15) =31a(16) =32a(17) =33a(18) =34a(19) =37a(20) =38a(21) =39a(22) =43a(23) =44a(24) =49a(25) =62a(26) =63a(27) =64a(28) =68a(29) =69