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A353029 as a simple table

na(n)
10
20
316
41152
516640
6140800
7887040
84616192
920987904
1086261760
11327782400
121169653760
133964207104
1412869828608
1540285306880
16122211532800
17360794030080
181040028008448
192935426646016
208130951905280
2122146344550400
2259411980615680
23157208570494976

[0,0,16,1152,16640,140800,887040,4616192,20987904,
 86261760,327782400,1169653760,3964207104,
 12869828608,40285306880,122211532800,360794030080,
 1040028008448,2935426646016,8130951905280,
 22146344550400,59411980615680,157208570494976]