Number of genera of imaginary quadratic field with discriminant -k, k = A003657(n).

Terms

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