Squares mod 50.

Terms

a(0) =0a(1) =1a(2) =4a(3) =6a(4) =9a(5) =11a(6) =14a(7) =16a(8) =19a(9) =21a(10) =24a(11) =25a(12) =26a(13) =29a(14) =31a(15) =34a(16) =36a(17) =39a(18) =41a(19) =44a(20) =46a(21) =49