E.g.f.: exp(1/5! * x^5 * exp(-x)).

Terms

a(0) =1a(1) =0a(2) =0a(3) =0a(4) =0a(5) =1a(6) =-6a(7) =21a(8) =-56a(9) =126a(10) =-126a(11) =-2310a(12) =32472a(13) =-287001a(14) =2016014a(15) =-11978967a(16) =58518096a(17) =-159272932a(18) =-1367358552a(19) =33638536548a(20) =-450849366456