Palindromes which are base-3 representations of squares.

Terms

a(0) =0a(1) =1a(2) =11a(3) =121a(4) =10201a(5) =11111a(6) =112211a(7) =122221a(8) =1002001a(9) =1120211a(10) =11022011a(11) =100020001a(12) =101212101a(13) =122111221a(14) =1012112101a(15) =1100220011a(16) =10000200001a(17) =10111011101a(18) =110002200011a(19) =111221122111