E.g.f.: exp(-(x + x^2/2 + x^3/3 + x^4/4)).

Terms

a(0) =1a(1) =-1a(2) =0a(3) =0a(4) =0a(5) =24a(6) =-24a(7) =-120a(8) =-720a(9) =-5040a(10) =32256a(11) =169344a(12) =743040a(13) =-380160a(14) =-91048320a(15) =-408710016a(16) =-174230784a(17) =29842525440a(18) =455765667840