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A045511 as a simple table

na(n)
1362880
23628800
339916800
4355687428096000
5304888344611713860501504000000
6371993326789901217467999448150835200000000

[362880,3628800,39916800,355687428096000,
 304888344611713860501504000000,
 371993326789901217467999448150835200000000]