G.f. A(x) satisfies A(x) = 1 + x/A(-x*A(x)^3)^3.

Terms

a(0) =1a(1) =1a(2) =3a(3) =6a(4) =10a(5) =-39a(6) =-546a(7) =-3563a(8) =-18918a(9) =-68472a(10) =-47978a(11) =2060310a(12) =25856241a(13) =210422728a(14) =1367033271a(15) =6837535155a(16) =18339297562a(17) =-114989342976