G.f. satisfies: A(x) = Sum_{n>=0} x^n * (1 + x*A(x)^(n+1))^n.

Terms

a(0) =1a(1) =1a(2) =2a(3) =5a(4) =16a(5) =58a(6) =228a(7) =949a(8) =4130a(9) =18633a(10) =86622a(11) =413106a(12) =2014489a(13) =10020342a(14) =50748198a(15) =261324021a(16) =1366804389a(17) =7255452421a(18) =39066835030a(19) =213287955245