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

Terms

a(0) =1a(1) =-1a(2) =0a(3) =2a(4) =-2a(5) =-6a(6) =16a(7) =20a(8) =-132a(9) =-28a(10) =1216a(11) =-936a(12) =-12440a(13) =23672a(14) =138048a(15) =-469456a(16) =-1601264a(17) =9112560a(18) =18108928a(19) =-182135008a(20) =-161934624a(21) =3804634784a(22) =-404007680a(23) =-83297957568a(24) =92590134208