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A131446 as a simple table

na(n)
11
21
31
48
515
6720
75040
813440
913440
103628800
11532224
1243545600
13691891200
14691891200
15108972864000
161902071808000
17118562476032000
186847458508800
1924329020081766400
2017888985354240000
211344498478202880000

[1,1,1,8,15,720,5040,13440,13440,3628800,532224,
 43545600,691891200,691891200,108972864000,
 1902071808000,118562476032000,6847458508800,
 24329020081766400,17888985354240000,
 1344498478202880000]