E.g.f.: exp(-1/4! * x^4 * exp(x)).

Terms

a(0) =1a(1) =0a(2) =0a(3) =0a(4) =-1a(5) =-5a(6) =-15a(7) =-35a(8) =-35a(9) =504a(10) =6090a(11) =45870a(12) =270930a(13) =1215500a(14) =1995994a(15) =-42118440a(16) =-733409495a(17) =-8069463780a(18) =-70153266240a(19) =-468024155016