a(n) = Sum(k^6*sigma(k)*sigma(n-k),k=1..n-1).

Terms

a(0) =0a(1) =1a(2) =195a(3) =3496a(4) =38195a(5) =192780a(6) =977386a(7) =3216320a(8) =9860049a(9) =27321870a(10) =65803045a(11) =144005856a(12) =308944925a(13) =635774072a(14) =1112550390a(15) =2153146880a(16) =3618341556a(17) =6391671525a(18) =9949570455a(19) =16725562160a(20) =24691972080a(21) =40979569092a(22) =56807498030a(23) =89450231040a(24) =120404165825