a(n) = A092143(n)/n!.

Terms

a(0) =1a(1) =1a(2) =1a(3) =2a(4) =2a(5) =12a(6) =12a(7) =96a(8) =288a(9) =2880a(10) =2880a(11) =414720a(12) =414720a(13) =5806080a(14) =87091200a(15) =5573836800a(16) =5573836800