d_3(n), or tau_3(n), the number of ordered factorizations of n as n = r s t.

Terms

a(0) =1a(1) =3a(2) =3a(3) =6a(4) =3a(5) =9a(6) =3a(7) =10a(8) =6a(9) =9a(10) =3a(11) =18a(12) =3a(13) =9a(14) =9a(15) =15a(16) =3a(17) =18a(18) =3a(19) =18a(20) =9a(21) =9a(22) =3a(23) =30a(24) =6a(25) =9a(26) =10a(27) =18a(28) =3a(29) =27