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A006523 as a simple table

na(n)
12
2240
3725760
412454041600
5711374856192000
6102181884343418880000
731022420086661971968000000
817683523987479403909087232000000
917366635237623772991036388802560000000
1027527506182452690092631959163161804800000000

[2,240,725760,12454041600,711374856192000,
 102181884343418880000,31022420086661971968000000,
 17683523987479403909087232000000,
 17366635237623772991036388802560000000,
 27527506182452690092631959163161804800000000]