a(n) = negative integer -n presented in balanced ternary system.

Terms

a(0) =2a(1) =21a(2) =20a(3) =22a(4) =211a(5) =210a(6) =212a(7) =201a(8) =200a(9) =202a(10) =221a(11) =220a(12) =222a(13) =2111a(14) =2110a(15) =2112a(16) =2101a(17) =2100a(18) =2102a(19) =2121a(20) =2120a(21) =2122a(22) =2011a(23) =2010a(24) =2012a(25) =2001a(26) =2000a(27) =2002a(28) =2021a(29) =2020