n expressed in Fibonacci binary-like number system using only 1's and 2's.

Terms

a(0) =1a(1) =2a(2) =12a(3) =22a(4) =121a(5) =221a(6) =122a(7) =1211a(8) =2211a(9) =1221a(10) =1212a(11) =2212a(12) =1222a(13) =2222a(14) =12211a(15) =12121a(16) =22121a(17) =12221a(18) =22221a(19) =12212a(20) =12122a(21) =22122a(22) =12222a(23) =121211a(24) =221211a(25) =122211a(26) =222211a(27) =122121a(28) =121221a(29) =221221