Denominator of Laguerre(n, -9).

Terms

a(0) =1a(1) =1a(2) =2a(3) =1a(4) =8a(5) =20a(6) =16a(7) =280a(8) =4480a(9) =64a(10) =44800a(11) =49280a(12) =1971200a(13) =1830400a(14) =14350336a(15) =896896000a(16) =74547200a(17) =243955712000a(18) =6823936000a(19) =109062553600