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

Terms

a(0) =1a(1) =-1a(2) =-1a(3) =3a(4) =7a(5) =-13a(6) =-89a(7) =-45a(8) =1191a(9) =4723a(10) =-6873a(11) =-143597a(12) =-499289a(13) =1843891a(14) =28132391a(15) =104223059a(16) =-508838745a(17) =-8597456141a(18) =-39770287321a(19) =158845792147