G.f.: A(x) = exp( Sum_{n>=1} sigma(n)*A000204(n)*x^n/n ).

Terms

a(0) =1a(1) =1a(2) =5a(3) =10a(4) =30a(5) =63a(6) =170a(7) =355a(8) =880a(9) =1875a(10) =4349a(11) =9189a(12) =20810a(13) =43355a(14) =95140a(15) =198247a(16) =424527a(17) =875965a(18) =1849535a(19) =3781820a(20) =7873167a(21) =16005196a(22) =32883560a(23) =66390850a(24) =135198990a(25) =271051271a(26) =546931398a(27) =1090751095a(28) =2183512495a(29) =4329540830