a(n) = Sum_{0 < d <= t <= n, d|n, t|n} d*t.

Terms

a(0) =1a(1) =7a(2) =13a(3) =35a(4) =31a(5) =97a(6) =57a(7) =155a(8) =130a(9) =227a(10) =133a(11) =497a(12) =183a(13) =413a(14) =418a(15) =651a(16) =307a(17) =988a(18) =381a(19) =1155a(20) =762a(21) =953a(22) =553a(23) =2225a(24) =806a(25) =1307a(26) =1210a(27) =2093a(28) =871a(29) =3242