Negasemiternary (or NST) representation of n.

Terms

a(0) =0a(1) =1a(2) =2a(3) =210a(4) =211a(5) =212a(6) =21120a(7) =21121a(8) =21122a(9) =21100a(10) =21101a(11) =21102a(12) =2112010a(13) =2112011a(14) =2112012a(15) =2112220a(16) =2112221a(17) =2112222a(18) =2112200a(19) =2112201a(20) =2112202a(21) =2110110a(22) =2110111a(23) =2110112a(24) =211201020a(25) =211201021a(26) =211201022a(27) =211201000a(28) =211201001a(29) =211201002