Representation of n in base of Catalan numbers (a classic greedy version).

Terms

a(0) =0a(1) =1a(2) =10a(3) =11a(4) =20a(5) =100a(6) =101a(7) =110a(8) =111a(9) =120a(10) =200a(11) =201a(12) =210a(13) =211a(14) =1000a(15) =1001a(16) =1010a(17) =1011a(18) =1020a(19) =1100a(20) =1101a(21) =1110a(22) =1111a(23) =1120a(24) =1200a(25) =1201a(26) =1210a(27) =1211a(28) =2000a(29) =2001