G.f. satisfies: A(x) = 1/(1 - x/A(-x*A(x)^5)).

Terms

a(0) =1a(1) =1a(2) =2a(3) =7a(4) =27a(5) =122a(6) =607a(7) =3208a(8) =17688a(9) =99803a(10) =571238a(11) =3292738a(12) =19001315a(13) =109303307a(14) =624615928a(15) =3537913240a(16) =19843769848a(17) =110273489737a(18) =608712132055