"Lazy binary" representation of n. Also called redundant binary representation of n.

Terms

a(0) =0a(1) =1a(2) =10a(3) =11a(4) =20a(5) =101a(6) =110a(7) =111a(8) =120a(9) =201a(10) =210a(11) =1011a(12) =1020a(13) =1101a(14) =1110a(15) =1111a(16) =1120a(17) =1201a(18) =1210a(19) =2011a(20) =2020a(21) =2101a(22) =2110a(23) =10111a(24) =10120a(25) =10201a(26) =10210a(27) =11011a(28) =11020a(29) =11101