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A352994 as a simple table

na(n)
10
20
372
41536
514400
692160
7470400
82064384
98128512
1029491200
11100362240
12324403200
131005109248
143005743104
158722022400
1624662507520
1768183654400
18184817811456
19492285984768
201291006771200
213338686955520
228526181171200
2321526669688832
2453788022931456

[0,0,72,1536,14400,92160,470400,2064384,8128512,
 29491200,100362240,324403200,1005109248,
 3005743104,8722022400,24662507520,68183654400,
 184817811456,492285984768,1291006771200,
 3338686955520,8526181171200,21526669688832,
 53788022931456]