a(n) = Sum_{k=1..n} k * sigma_3(k).

Terms

a(0) =1a(1) =19a(2) =103a(3) =395a(4) =1025a(5) =2537a(6) =4945a(7) =9625a(8) =16438a(9) =27778a(10) =42430a(11) =66958a(12) =95532a(13) =138876a(14) =191796a(15) =266692a(16) =350230a(17) =472864a(18) =603204a(19) =787164a(20) =989436a(21) =1253172a(22) =1533036a(23) =1926156a(24) =2319931a(25) =2834263a(26) =3386143a(27) =4089279a(28) =4796589a(29) =5749149