9^a(n) is smallest power of 9 beginning with n.

Terms

a(0) =0a(1) =12a(2) =9a(3) =7a(4) =5a(5) =4a(6) =3a(7) =2a(8) =1a(9) =21a(10) =42a(11) =20a(12) =19a(13) =40a(14) =18a(15) =17a(16) =60a(17) =16a(18) =59a(19) =15a(20) =80a(21) =14a(22) =101a(23) =57a(24) =13a(25) =78a(26) =34a(27) =12a(28) =77a(29) =33