a(n) = Product_{k=1..n} Stirling2(n,k) * k!.A308942a(n) = Product_{k=1..n} Stirling2(n,k) * k!.Terms a(0) =1a(1) =1a(2) =2a(3) =36a(4) =12096a(5) =129600000External referencesoeis: A308942