n written in fractional base 10/2.

Terms

a(0) =0a(1) =1a(2) =2a(3) =3a(4) =4a(5) =5a(6) =6a(7) =7a(8) =8a(9) =9a(10) =20a(11) =21a(12) =22a(13) =23a(14) =24a(15) =25a(16) =26a(17) =27a(18) =28a(19) =29a(20) =40a(21) =41a(22) =42a(23) =43a(24) =44a(25) =45a(26) =46a(27) =47a(28) =48a(29) =49