Sum_{k=1..n-1} J(2*n,k)*k, where J(i,j) is the Jacobi symbol.

Terms

a(0) =0a(1) =1a(2) =1a(3) =-2a(4) =4a(5) =-4a(6) =3a(7) =16a(8) =3a(9) =0a(10) =15a(11) =-12a(12) =16a(13) =-16a(14) =10a(15) =0a(16) =24a(17) =54a(18) =51a(19) =-28a(20) =56a(21) =-28a(22) =1a(23) =0a(24) =-10a(25) =0a(26) =25a(27) =-40a(28) =96a(29) =-48