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A323340 as a simple table

na(n)
01
11
22
33
43
560
6360
770
81680
93780
1075600
11138600
12285120
13129729600
14363242880
153405402000
161009008000
17308756448000
185557616064000
1952797352608000
20351982350720000
21221748880953600
221524523556556000
23738190353700800
2413464592051502592000

[1,1,2,3,3,60,360,70,1680,3780,75600,138600,
 285120,129729600,363242880,3405402000,1009008000,
 308756448000,5557616064000,52797352608000,
 351982350720000,221748880953600,1524523556556000,
 738190353700800,13464592051502592000]