Product of n and the sum of all divisors of all positive integers <= n.

Terms

a(0) =1a(1) =8a(2) =24a(3) =60a(4) =105a(5) =198a(6) =287a(7) =448a(8) =621a(9) =870a(10) =1089a(11) =1524a(12) =1833a(13) =2310a(14) =2835a(15) =3520a(16) =4046a(17) =4986a(18) =5643a(19) =6780a(20) =7791a(21) =8954a(22) =9913a(23) =11784a(24) =13050a(25) =14664a(26) =16308a(27) =18480a(28) =20010a(29) =22860