G.f. satisfies: A(x/A(x)) = 1 + x*A(x)^2.

Terms

a(0) =1a(1) =1a(2) =3a(3) =15a(4) =100a(5) =801a(6) =7296a(7) =73174a(8) =791751a(9) =9116613a(10) =110640310a(11) =1405349658a(12) =18585016509a(13) =254855278565