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A337313 as a simple table

na(n)
10
20
3648
43888
516200
658320
7195048
8625968
91960200
106045840
1118468648
1256068848
13169533000
14511252560
151539065448
164627812528
1713904670600
1841756478480
19125354369448
20376232977008
211129038669000
223387795483600
2310164745404648
2430496954122288
2591496298184200

[0,0,648,3888,16200,58320,195048,625968,1960200,
 6045840,18468648,56068848,169533000,511252560,
 1539065448,4627812528,13904670600,41756478480,
 125354369448,376232977008,1129038669000,
 3387795483600,10164745404648,30496954122288,
 91496298184200]