a(n) = n^2*sigma_2(n).

Terms

a(0) =0a(1) =1a(2) =20a(3) =90a(4) =336a(5) =650a(6) =1800a(7) =2450a(8) =5440a(9) =7371a(10) =13000a(11) =14762a(12) =30240a(13) =28730a(14) =49000a(15) =58500a(16) =87296a(17) =83810a(18) =147420a(19) =130682a(20) =218400a(21) =220500a(22) =295240a(23) =280370a(24) =489600a(25) =406875a(26) =574600a(27) =597780a(28) =823200a(29) =708122