E.g.f. sqrt(1+2*x*exp(2*x)).

Terms

a(0) =1a(1) =1a(2) =3a(3) =3a(4) =-7a(5) =25a(6) =267a(7) =-2261a(8) =-9231a(9) =284337a(10) =-464365a(11) =-45533741a(12) =430558185a(13) =8212158409a(14) =-201645489381