a(n) = A003958(sigma(n)) * A064989(sigma(n)).

Terms

a(0) =1a(1) =4a(2) =1a(3) =30a(4) =4a(5) =4a(6) =1a(7) =48a(8) =132a(9) =16a(10) =4a(11) =30a(12) =30a(13) =4a(14) =4a(15) =870a(16) =16a(17) =528a(18) =12a(19) =120a(20) =1a(21) =16a(22) =4a(23) =48a(24) =870a(25) =120a(26) =12a(27) =30a(28) =48a(29) =16