Expansion of e.g.f. exp(x * (1-2*x)).

Terms

a(0) =1a(1) =1a(2) =-3a(3) =-11a(4) =25a(5) =201a(6) =-299a(7) =-5123a(8) =3249a(9) =167185a(10) =50221a(11) =-6637179a(12) =-8846903a(13) =309737689a(14) =769776645a(15) =-16575533939a(16) =-62762132639a(17) =998072039457