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

Terms

a(0) =1a(1) =3a(2) =4a(3) =9a(4) =6a(5) =24a(6) =8a(7) =41a(8) =37a(9) =68a(10) =12a(11) =258a(12) =14a(13) =192a(14) =384a(15) =593a(16) =18a(17) =1557a(18) =20a(19) =2794a(20) =2552a(21) =2192a(22) =24a(23) =16730a(24) =3151a(25) =8388a(26) =20440a(27) =35394a(28) =30a(29) =116474