a(n) = n * Sum_{d|n} sigma(d)^3 / d.

Terms

a(0) =1a(1) =29a(2) =67a(3) =401a(4) =221a(5) =1943a(6) =519a(7) =4177a(8) =2398a(9) =6409a(10) =1739a(11) =26867a(12) =2757a(13) =15051a(14) =14807a(15) =38145a(16) =5849a(17) =69542a(18) =8019a(19) =88621a(20) =34773a(21) =50431a(22) =13847a(23) =279859a(24) =30896a(25) =79953a(26) =71194a(27) =208119a(28) =27029a(29) =429403