a(n) = n^2 written in base 3.

Terms

a(0) =0a(1) =1a(2) =11a(3) =100a(4) =121a(5) =221a(6) =1100a(7) =1211a(8) =2101a(9) =10000a(10) =10201a(11) =11111a(12) =12100a(13) =20021a(14) =21021a(15) =22100a(16) =100111a(17) =101201a(18) =110000a(19) =111101a(20) =112211a(21) =121100a(22) =122221a(23) =201121a(24) =210100a(25) =212011a(26) =221001a(27) =1000000a(28) =1002001a(29) =1011011