Numbers in base -3.

Terms

a(0) =0a(1) =1a(2) =2a(3) =120a(4) =121a(5) =122a(6) =110a(7) =111a(8) =112a(9) =100a(10) =101a(11) =102a(12) =220a(13) =221a(14) =222a(15) =210a(16) =211a(17) =212a(18) =200a(19) =201a(20) =202a(21) =12020a(22) =12021a(23) =12022a(24) =12010a(25) =12011a(26) =12012a(27) =12000a(28) =12001a(29) =12002