n written in fractional base 9/3.

Terms

a(0) =0a(1) =1a(2) =2a(3) =3a(4) =4a(5) =5a(6) =6a(7) =7a(8) =8a(9) =30a(10) =31a(11) =32a(12) =33a(13) =34a(14) =35a(15) =36a(16) =37a(17) =38a(18) =60a(19) =61a(20) =62a(21) =63a(22) =64a(23) =65a(24) =66a(25) =67a(26) =68a(27) =300a(28) =301a(29) =302