Write 2n-1 in base 9 and juxtapose.

Terms

a(0) =1a(1) =3a(2) =5a(3) =7a(4) =1a(5) =0a(6) =1a(7) =2a(8) =1a(9) =4a(10) =1a(11) =6a(12) =1a(13) =8a(14) =2a(15) =1a(16) =2a(17) =3a(18) =2a(19) =5a(20) =2a(21) =7a(22) =3a(23) =0a(24) =3a(25) =2a(26) =3a(27) =4a(28) =3a(29) =6