L.g.f.: Sum_{n>=1} (Sum_{d|n} d*x^d)^n/n = Sum_{n>=1} a(n)*x^n/n.

Terms

a(0) =1a(1) =1a(2) =7a(3) =9a(4) =26a(5) =37a(6) =162a(7) =329a(8) =1087a(9) =2526a(10) =6810a(11) =15009a(12) =32514a(13) =66312a(14) =136877a(15) =276137a(16) =632401a(17) =1546003a(18) =4648446a(19) =14647994a(20) =47229840a(21) =145042888a(22) =423449873a(23) =1161865841a(24) =3026208201a(25) =7457926620a(26) =17580700762a(27) =39758132780a(28) =87567965436a(29) =188225902377