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

Terms

a(0) =1a(1) =1a(2) =3a(3) =12a(4) =59a(5) =331a(6) =2062a(7) =13945a(8) =100981a(9) =775099a(10) =6260336a(11) =52914052a(12) =466062718a(13) =4263629043a(14) =40404127710a(15) =395772643255