Difference between sums of quadratic residues and non-residues modulo n that are coprime to n.

Terms

a(0) =0a(1) =1a(2) =-1a(3) =-2a(4) =0a(5) =-4a(6) =-7a(7) =-14a(8) =-3a(9) =0a(10) =-11a(11) =-22a(12) =0a(13) =0a(14) =-50a(15) =-44a(16) =0a(17) =-12a(18) =-19a(19) =-60a(20) =-84a(21) =-44a(22) =-69a(23) =-94a(24) =0a(25) =0a(26) =-9a(27) =-98a(28) =0a(29) =-80