Squares mod 68.

Terms

a(0) =0a(1) =1a(2) =4a(3) =8a(4) =9a(5) =13a(6) =16a(7) =17a(8) =21a(9) =25a(10) =32a(11) =33a(12) =36a(13) =49a(14) =52a(15) =53a(16) =60a(17) =64