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A028367 as a simple table

na(n)
11
22
3720
487178291200
5265252859812191058636308480000000
631469973260387937525653122354950764088012280797258232192163168247821107200000000000000

[1,2,720,87178291200,
 265252859812191058636308480000000,
 31469973260387937525653122354950764088012280797258\
 232192163168247821107200000000000000]