Partial sums of floor(n!/e^n).

Terms

a(0) =0a(1) =0a(2) =0a(3) =0a(4) =0a(5) =1a(6) =5a(7) =18a(8) =62a(9) =226a(10) =892a(11) =3835a(12) =17910a(13) =90401a(14) =490421a(15) =2844970a(16) =17570207a(17) =115078228a(18) =796630963a(19) =5811215750a(20) =44551231383a(21) =358087648032