Denominator of 120*Stirling_2(n,5)/n!.

Terms

a(0) =1a(1) =2a(2) =3a(3) =8a(4) =144a(5) =32a(6) =3024a(7) =3024a(8) =51840a(9) =48384a(10) =997920a(11) =1419264a(12) =174356582400a(13) =209227898880a(14) =44834549760a(15) =5977939968