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A025527 as a simple table

na(n)
11
21
31
42
52
612
712
848
9144
101440
111440
1217280
1317280
14241920
153628800
1629030400
1729030400
18522547200
19522547200
2010450944000
21219469824000
224828336128000
234828336128000
24115880067072000
25579400335360000
2615064408719360000

[1,1,1,2,2,12,12,48,144,1440,1440,17280,17280,
 241920,3628800,29030400,29030400,522547200,
 522547200,10450944000,219469824000,4828336128000,
 4828336128000,115880067072000,579400335360000,
 15064408719360000]