Expansion of e.g.f. Product_{k>=1} (1 - x^k/k!)^3.

Terms

a(0) =1a(1) =-3a(2) =3a(3) =18a(4) =-57a(5) =-138a(6) =246a(7) =4281a(8) =13383a(9) =-156906a(10) =-450822a(11) =-957729a(12) =23375886a(13) =289894875a(14) =-179027895a(15) =-3403581357a(16) =-174968380137a(17) =-419588974650