Numbers whose base-6 representation Sum_{i=0..m} d(i)*6^i has d(m) <= d(m-1) >= d(m-2) <= ...

Terms

a(0) =1a(1) =2a(2) =3a(3) =4a(4) =5a(5) =7a(6) =8a(7) =9a(8) =10a(9) =11a(10) =14a(11) =15a(12) =16a(13) =17a(14) =21a(15) =22a(16) =23a(17) =28a(18) =29a(19) =35a(20) =42a(21) =43a(22) =48a(23) =49a(24) =50a(25) =54a(26) =55a(27) =56a(28) =57a(29) =60