G.f. satisfies: A(x - x*A(x) - x*A(x)^2) = x.

Terms

a(0) =1a(1) =1a(2) =4a(3) =21a(4) =134a(5) =968a(6) =7662a(7) =65135a(8) =587040a(9) =5559342a(10) =54965230a(11) =564651110a(12) =6004908296a(13) =65920345700a(14) =745289233564