Number of ways n can be properly factored.

Terms

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