a(n) is the first k such that the fractional part of k^(1/3) starts with n.

Terms

a(0) =9a(1) =10a(2) =2a(3) =13a(4) =3a(5) =4a(6) =18a(7) =5a(8) =6a(9) =7a(10) =30a(11) =134a(12) =70a(13) =231a(14) =31a(15) =10a(16) =72a(17) =32a(18) =139a(19) =74a(20) =33a(21) =75a(22) =11a(23) =34a(24) =144a(25) =2a(26) =146a(27) =35a(28) =12a(29) =79