Denominator of 24*Stirling_2(n,4)/n!.

Terms

a(0) =1a(1) =1a(2) =6a(3) =3a(4) =80a(5) =72a(6) =30240a(7) =3024a(8) =1814400a(9) =25920a(10) =2661120a(11) =3991680a(12) =871782912000a(13) =87178291200a(14) =241416806400a(15) =44834549760