E.g.f.: exp(1/4! * x^4 * exp(-x)).

Terms

a(0) =1a(1) =0a(2) =0a(3) =0a(4) =1a(5) =-5a(6) =15a(7) =-35a(8) =105a(9) =-756a(10) =6510a(11) =-46530a(12) =283470a(13) =-1667380a(14) =11457446a(15) =-99776040a(16) =969295145a(17) =-9298091180a(18) =86154691680a(19) =-804769174536