Class numbers h(D) of imaginary quadratic fields with discriminant D=1-4*n.

Terms

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