G.f. satisfies A(x) = 1 + x*A(x)^4 - x^2*A(x)^5.

Terms

a(0) =1a(1) =1a(2) =3a(3) =13a(4) =67a(5) =380a(6) =2288a(7) =14351a(8) =92737a(9) =613063a(10) =4126289a(11) =28179766a(12) =194780822a(13) =1360053081a(14) =9578997279a(15) =67971291791a(16) =485464864401