E.g.f. (1-x)^3/(1-4x+3x^2-x^3).

Terms

a(0) =1a(1) =1a(2) =8a(3) =78a(4) =984a(5) =15480a(6) =292320a(7) =6441120a(8) =162207360a(9) =4595512320a(10) =144662112000