Squares of the form k + reverse(k) for at least one k.

Terms

a(0) =4a(1) =16a(2) =121a(3) =484a(4) =625a(5) =1089a(6) =10201a(7) =14641a(8) =19881a(9) =40804a(10) =49284a(11) =69696a(12) =91809a(13) =94249a(14) =203401a(15) =698896a(16) =1002001a(17) =1234321a(18) =1490841a(19) =1517824a(20) =4008004a(21) =4276624a(22) =4460544a(23) =4937284a(24) =5313025a(25) =6325225a(26) =6895876a(27) =6948496a(28) =7706176a(29) =9018009