Palindromes of form k^2 + 1.

Terms

a(0) =1a(1) =2a(2) =5a(3) =101a(4) =626a(5) =10001a(6) =1000001a(7) =1040401a(8) =2217122a(9) =5053505a(10) =100000001a(11) =101808101a(12) =10000000001a(13) =10182828101a(14) =10408080401a(15) =28053235082