Expansion of e.g.f. 1/(1-2*x^2-x^3).

Terms

a(0) =1a(1) =0a(2) =4a(3) =6a(4) =96a(5) =480a(6) =6480a(7) =60480a(8) =887040a(9) =11975040a(10) =203212800a(11) =3512678400a(12) =69455232000