G.f. A(x) satisfies A(x) = 1 - x/A(x)^3 * (1 - A(x) - A(x)^4).

Terms

a(0) =1a(1) =1a(2) =2a(3) =1a(4) =-4a(5) =0a(6) =37a(7) =16a(8) =-313a(9) =-214a(10) =3005a(11) =2943a(12) =-30391a(13) =-39432a(14) =318606a(15) =522863a(16) =-3418205a(17) =-6889626a(18) =37219105a(19) =90415336a(20) =-408758113a(21) =-1183054415a(22) =4505089166a(23) =15442590040a(24) =-49599878555a(25) =-201138280510a(26) =542949788652