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

Terms

a(0) =1a(1) =0a(2) =4a(3) =8a(4) =72a(5) =416a(6) =3520a(7) =31104a(8) =316288a(9) =3525632a(10) =43117056a(11) =572195840a(12) =8191304704a(13) =125761056768