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

Terms

a(0) =1a(1) =5a(2) =29a(3) =193a(4) =1457a(5) =12341a(6) =116125a(7) =1203329a(8) =13627073a(9) =167525317a(10) =2222710781a(11) =31665408545a(12) =482196718129