Nialpdromes: digits in base 6 are in nonincreasing order.

Terms

a(0) =0a(1) =1a(2) =2a(3) =3a(4) =4a(5) =5a(6) =6a(7) =7a(8) =12a(9) =13a(10) =14a(11) =18a(12) =19a(13) =20a(14) =21a(15) =24a(16) =25a(17) =26a(18) =27a(19) =28a(20) =30a(21) =31a(22) =32a(23) =33a(24) =34a(25) =35a(26) =36a(27) =42a(28) =43a(29) =72