A077175(n) / A077176(n).

Terms

a(0) =1a(1) =1a(2) =2a(3) =24a(4) =64a(5) =540a(6) =8640a(7) =34560a(8) =103680a(9) =3326400a(10) =23224320a(11) =96768000a(12) =764225280a(13) =24385536000a(14) =108391219200