a(n) = n! * [x^n] exp(n*(1 - exp(x))).

Terms

a(0) =1a(1) =-1a(2) =2a(3) =-3a(4) =-20a(5) =370a(6) =-4074a(7) =34293a(8) =-138312a(9) =-2932533a(10) =106271090a(11) =-2192834490a(12) =32208497124a(13) =-206343936097