G.f.: A(x) = exp( Sum_{n>=1} A056045(n)/n*x^n ), where A056045(n) = Sum_{d|n} binomial(n,d).

Terms

a(0) =1a(1) =1a(2) =2a(3) =3a(4) =6a(5) =8a(6) =18a(7) =23a(8) =49a(9) =73a(10) =145a(11) =194a(12) =474a(13) =611a(14) =1331a(15) =2027a(16) =4393a(17) =5919a(18) =14736a(19) =19415a(20) =46487a(21) =68504a(22) =156618a(23) =212055a(24) =560380a(25) =739165a(26) =1833012a(27) =2657837a(28) =6513367a(29) =8743208