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A001754 as a simple table

na(n)
10
20
31
412
5120
61200
712600
8141120
91693440
1021772800
11299376000
124390848000
1368497228800
141133317785600
1519833061248000
16366148823040000
177113748561920000
18145120470663168000
193101950060425216000
2069337707233034240000
211617879835437465600000

[0,0,1,12,120,1200,12600,141120,1693440,21772800,
 299376000,4390848000,68497228800,1133317785600,
 19833061248000,366148823040000,7113748561920000,
 145120470663168000,3101950060425216000,
 69337707233034240000,1617879835437465600000]