G.f. A(x) satisfies A(x) = 1 + x*A(x)^4 - x^2*A(x)^7.

Terms

a(0) =1a(1) =1a(2) =3a(3) =11a(4) =42a(5) =153a(6) =469a(7) =690a(8) =-5967a(9) =-82708a(10) =-700876a(11) =-4989894a(12) =-32082336a(13) =-190742496a(14) =-1053280998a(15) =-5347579160a(16) =-24162468390a(17) =-88249158963a(18) =-157067396045