Even palindromes in which parity of digits alternates.

Terms

a(0) =0a(1) =2a(2) =4a(3) =6a(4) =8a(5) =212a(6) =232a(7) =252a(8) =272a(9) =292a(10) =414a(11) =434a(12) =454a(13) =474a(14) =494a(15) =616a(16) =636a(17) =656a(18) =676a(19) =696a(20) =818a(21) =838a(22) =858a(23) =878a(24) =898a(25) =21012a(26) =21212a(27) =21412a(28) =21612a(29) =21812