Number of positive definite reduced binary quadratic forms of discriminant -4*n.

Terms

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