n written in fractional base 8/2.

Terms

a(0) =0a(1) =1a(2) =2a(3) =3a(4) =4a(5) =5a(6) =6a(7) =7a(8) =20a(9) =21a(10) =22a(11) =23a(12) =24a(13) =25a(14) =26a(15) =27a(16) =40a(17) =41a(18) =42a(19) =43a(20) =44a(21) =45a(22) =46a(23) =47a(24) =60a(25) =61a(26) =62a(27) =63a(28) =64a(29) =65