If n = Product p(k)^e(k) then a(n) = Product (p(k)+1)^e(k), a(1) = 1.

Terms

a(0) =1a(1) =3a(2) =4a(3) =9a(4) =6a(5) =12a(6) =8a(7) =27a(8) =16a(9) =18a(10) =12a(11) =36a(12) =14a(13) =24a(14) =24a(15) =81a(16) =18a(17) =48a(18) =20a(19) =54a(20) =32a(21) =36a(22) =24a(23) =108a(24) =36a(25) =42a(26) =64a(27) =72a(28) =30a(29) =72