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

Terms

a(0) =1a(1) =-1a(2) =-1a(3) =-1a(4) =1a(5) =139a(6) =151a(7) =-1429a(8) =-19039a(9) =-170281a(10) =517231a(11) =12144439a(12) =108063649a(13) =294730019a(14) =-12338255929a(15) =-161010756061a(16) =-834576525119