E.g.f. satisfies: A(A(x))^3 = A(x)^3 * A'(x).

Terms

a(0) =1a(1) =0a(2) =6a(3) =0a(4) =540a(5) =0a(6) =156240a(7) =0a(8) =96480720a(9) =0a(10) =104661849600a(11) =0a(13) =0a(15) =0a(17) =0a(19) =0a(21) =0