Expansion of e.g.f. exp((x / (1-x))^4).

Terms

a(0) =1a(1) =0a(2) =0a(3) =0a(4) =24a(5) =480a(6) =7200a(7) =100800a(8) =1431360a(9) =21772800a(10) =370137600a(11) =7185024000a(12) =158150361600