n written in fractional base 9/2.

Terms

a(0) =0a(1) =1a(2) =2a(3) =3a(4) =4a(5) =5a(6) =6a(7) =7a(8) =8a(9) =20a(10) =21a(11) =22a(12) =23a(13) =24a(14) =25a(15) =26a(16) =27a(17) =28a(18) =40a(19) =41a(20) =42a(21) =43a(22) =44a(23) =45a(24) =46a(25) =47a(26) =48a(27) =60a(28) =61a(29) =62