Nialpdromes: digits in base 7 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) =14a(10) =15a(11) =16a(12) =21a(13) =22a(14) =23a(15) =24a(16) =28a(17) =29a(18) =30a(19) =31a(20) =32a(21) =35a(22) =36a(23) =37a(24) =38a(25) =39a(26) =40a(27) =42a(28) =43a(29) =44