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A002690 as a simple table

na(n)
01
14
236
3480
48400
5181440
64656960
7138378240
84670265600
9176432256000
107374868300800
11337903056691200
1216838835658444800
13906706535454720000
1452459449551308800000
153245491278907637760000
16213796737998040637440000

[1,4,36,480,8400,181440,4656960,138378240,
 4670265600,176432256000,7374868300800,
 337903056691200,16838835658444800,
 906706535454720000,52459449551308800000,
 3245491278907637760000,213796737998040637440000]