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A375799 as a simple table

na(n)
01
11
22
36
436
5240
61800
716800
8178080
92086560
1027518400
11399168000
126286896000
13107623676160
141984274772480
1539143052748800
16824445099878400
1718450791322163200
18437015358530150400
1910929450232744243200
20287728555881102336000
217952251084537503744000

[1,1,2,6,36,240,1800,16800,178080,2086560,
 27518400,399168000,6286896000,107623676160,
 1984274772480,39143052748800,824445099878400,
 18450791322163200,437015358530150400,
 10929450232744243200,287728555881102336000,
 7952251084537503744000]