a(n) = Sum_{ d divides n } (n/d)^(2d).

Terms

a(0) =1a(1) =5a(2) =10a(3) =33a(4) =26a(5) =182a(6) =50a(7) =577a(8) =811a(9) =1750a(10) =122a(11) =16194a(12) =170a(13) =18982a(14) =74900a(15) =135425a(16) =290a(17) =847127a(18) =362a(19) =2498178a(20) =4901060a(21) =4209430a(22) =530a(23) =78564226a(24) =9766251a(25) =67138102a(26) =387952660a(27) =542674914a(28) =842a(29) =4866184552