a(n) = n^3*sigma_2(n).

Terms

a(0) =0a(1) =1a(2) =40a(3) =270a(4) =1344a(5) =3250a(6) =10800a(7) =17150a(8) =43520a(9) =66339a(10) =130000a(11) =162382a(12) =362880a(13) =373490a(14) =686000a(15) =877500a(16) =1396736a(17) =1424770a(18) =2653560a(19) =2482958a(20) =4368000a(21) =4630500a(22) =6495280a(23) =6448510a(24) =11750400a(25) =10171875a(26) =14939600a(27) =16140060a(28) =23049600a(29) =20535538