Happy palindromic numbers.

Terms

a(0) =1a(1) =7a(2) =44a(3) =262a(4) =313a(5) =383a(6) =404a(7) =464a(8) =565a(9) =656a(10) =818a(11) =888a(12) =989a(13) =1221a(14) =1771a(15) =1881a(16) =2112a(17) =3553a(18) =4004a(19) =4554a(20) =4774a(21) =5335a(22) =5445a(23) =5555a(24) =7117a(25) =7447a(26) =7887a(27) =8118a(28) =8778a(29) =11311