Palindromes in base 3 (written in base 3).

Terms

a(0) =0a(1) =1a(2) =2a(3) =11a(4) =22a(5) =101a(6) =111a(7) =121a(8) =202a(9) =212a(10) =222a(11) =1001a(12) =1111a(13) =1221a(14) =2002a(15) =2112a(16) =2222a(17) =10001a(18) =10101a(19) =10201a(20) =11011a(21) =11111a(22) =11211a(23) =12021a(24) =12121a(25) =12221a(26) =20002a(27) =20102a(28) =20202a(29) =21012