Quotients p!/n arising in A139171.

Terms

a(0) =2a(1) =1a(2) =2a(3) =30a(4) =24a(5) =1a(6) =720a(7) =15a(8) =560a(9) =12a(10) =3628800a(11) =10a(12) =479001600a(13) =360a(14) =8a(15) =315a(17) =280a(19) =6a(20) =240a(21) =1814400a(23) =5a(24) =1596672a(25) =239500800a(26) =1478400a(27) =180a(29) =4