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A165975 as a simple table

na(n)
01
12
2112
3261360
427983155200
5143829595278720000
636441048083860298170220544
7463109968103790656729135319264000000
8298869615482782118878970689211942578421760000000

[1,2,112,261360,27983155200,143829595278720000,
 36441048083860298170220544,
 463109968103790656729135319264000000,
 298869615482782118878970689211942578421760000000]