a(n)=least k such that base 9 representation of n begins at s(k), where s=A031076.

Terms

a(0) =1a(1) =2a(2) =3a(3) =4a(4) =5a(5) =6a(6) =7a(7) =8a(8) =9a(9) =11a(10) =1a(11) =15a(12) =17a(13) =19a(14) =21a(15) =23a(16) =25a(17) =27a(18) =14a(19) =31a(20) =2a(21) =35a(22) =37a(23) =39a(24) =41a(25) =43a(26) =45a(27) =16a(28) =34a(29) =51