Expansion of g.f.: 1/(Sum_{k >= 0} k!*x^k).

Terms

a(0) =1a(1) =-1a(2) =-1a(3) =-3a(4) =-13a(5) =-71a(6) =-461a(7) =-3447a(8) =-29093a(9) =-273343a(10) =-2829325a(11) =-31998903a(12) =-392743957a(13) =-5201061455a(14) =-73943424413