Palindromic Ulam numbers.

Terms

a(0) =1a(1) =2a(2) =3a(3) =4a(4) =6a(5) =8a(6) =11a(7) =77a(8) =99a(9) =131a(10) =282a(11) =363a(12) =414a(13) =434a(14) =585a(15) =646a(16) =949a(17) =2112a(18) =2332a(19) =2552a(20) =2662a(21) =5335a(22) =5665a(23) =8008a(24) =8338a(25) =8668a(26) =10501a(27) =13531a(28) =13931a(29) =15251