a(n) = sigma_2(n) * sigma_3(n).

Terms

a(0) =1a(1) =45a(2) =280a(3) =1533a(4) =3276a(5) =12600a(6) =17200a(7) =49725a(8) =68887a(9) =147420a(10) =162504a(11) =429240a(12) =373660a(13) =774000a(14) =917280a(15) =1596221a(16) =1425060a(17) =3099915a(18) =2483320a(19) =5022108a(20) =4816000a(21) =7312680a(22) =6449040a(23) =13923000a(24) =10253901a(25) =16814700a(26) =16760800a(27) =26367600a(28) =20536380a(29) =41277600