G.f. A(x) satisfies: A(x*B(x)) = x^2 - x^3, where A(B(x)) = x.

Terms

a(0) =1a(1) =1a(2) =3a(3) =8a(4) =28a(5) =95a(6) =351a(7) =1309a(8) =5056a(9) =19787a(10) =78847a(11) =317705a(12) =1294673a(13) =5321598a(14) =22047985a(15) =91957296a(16) =385832452a(17) =1627351862a(18) =6896087775a(19) =29345806842a(20) =125353612440a(21) =537303633158