Expansion of exp ( - x - (1/2)*x^2 - (1/6)*x^3).

Terms

a(0) =1a(1) =-1a(2) =0a(3) =1a(4) =2a(5) =-6a(6) =-14a(7) =20a(8) =204a(9) =28a(10) =-2584a(11) =-6876a(12) =33760a(13) =219296a(14) =-121848a(15) =-6020456a(16) =-15177904a(17) =126126960a(18) =950679424a(19) =-898745392a(20) =-38731873824a(21) =-123922308896