Smallest palindromic number >= 3^n.

Terms

a(0) =1a(1) =3a(2) =9a(3) =33a(4) =88a(5) =252a(6) =737a(7) =2222a(8) =6666a(9) =19691a(10) =59095a(11) =177771a(12) =532235a(13) =1594951a(14) =4783874a(15) =14355341a(16) =43055034a(17) =129141921a(18) =387424783a(19) =1162332611a(20) =3486886843a(21) =10460406401a(22) =31381118313a(23) =94143234149a(24) =282429924282a(25) =847288882748