a(n) = n*sigma_6(n).

Terms

a(0) =0a(1) =1a(2) =130a(3) =2190a(4) =16644a(5) =78130a(6) =284700a(7) =823550a(8) =2130440a(9) =4789539a(10) =10156900a(11) =19487182a(12) =36450360a(13) =62748530a(14) =107061500a(15) =171104700a(16) =272696336a(17) =410338690a(18) =622640070a(19) =893871758a(20) =1300395720a(21) =1803574500a(22) =2533333660a(23) =3404825470a(24) =4665663600a(25) =6103906275a(26) =8157308900a(27) =10474721820