a(n) = Sum_{d|n} d^tau(d).

Terms

a(0) =1a(1) =5a(2) =10a(3) =69a(4) =26a(5) =1310a(6) =50a(7) =4165a(8) =739a(9) =10030a(10) =122a(11) =2987358a(12) =170a(13) =38470a(14) =50660a(15) =1052741a(16) =290a(17) =34014263a(18) =362a(19) =64010094a(20) =194540a(21) =234382a(22) =530a(23) =110078305630a(24) =15651a(25) =457150a(26) =532180a(27) =481928838a(28) =842a(29) =656100061960