a(n) = n! / A055773(n).

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =8a(5) =8a(6) =144a(7) =144a(8) =1152a(9) =10368a(10) =518400a(11) =518400a(12) =6220800a(13) =6220800a(14) =609638400a(15) =9144576000a(16) =146313216000a(17) =146313216000