a(n) = Sum_{d divides n} d^(n/d + 1).

Terms

a(0) =1a(1) =5a(2) =10a(3) =25a(4) =26a(5) =80a(6) =50a(7) =161a(8) =163a(9) =290a(10) =122a(11) =988a(12) =170a(13) =796a(14) =1580a(15) =2305a(16) =290a(17) =5561a(18) =362a(19) =10670a(20) =9404a(21) =5912a(22) =530a(23) =58436a(24) =16251a(25) =19258a(26) =66340a(27) =118640a(28) =842a(29) =381740