Squares whose base-3 expansion has no 2.

Terms

a(0) =0a(1) =1a(2) =4a(3) =9a(4) =36a(5) =81a(6) =121a(7) =256a(8) =324a(9) =361a(10) =729a(11) =841a(12) =1089a(13) =2304a(14) =2916a(15) =3025a(16) =3249a(17) =6561a(18) =6889a(19) =7569a(20) =9801a(21) =20449a(22) =20736a(23) =26244a(24) =26569a(25) =27225a(26) =29241a(27) =59049a(28) =60025a(29) =62001