a(n) = n! * Laguerre(n,-8).

Terms

a(0) =1a(1) =9a(2) =98a(3) =1238a(4) =17688a(5) =280888a(6) =4894672a(7) =92676144a(8) =1891712384a(9) =41361536384a(10) =963532779264