a(n) = Sum_{r|n, s|n, t|n, r<s<t} r*s*t.

Terms

a(0) =0a(1) =0a(2) =0a(3) =8a(4) =0a(5) =72a(6) =0a(7) =120a(8) =27a(9) =180a(10) =0a(11) =1400a(12) =0a(13) =336a(14) =360a(15) =1240a(16) =0a(17) =3285a(18) =0a(19) =3948a(20) =672a(21) =792a(22) =0a(23) =15960a(24) =125a(25) =1092a(26) =1080a(27) =8240a(28) =0a(29) =25992