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A052556 as a simple table

na(n)
01
11
22
312
472
5480
64320
745360
8524160
96894720
10101606400
111636588800
1228740096000
13547977830400
1411245999564800
15247150455552000
165795612798976000
17144409095806976000
183809412354908160000

[1,1,2,12,72,480,4320,45360,524160,6894720,
 101606400,1636588800,28740096000,547977830400,
 11245999564800,247150455552000,5795612798976000,
 144409095806976000,3809412354908160000]