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A069121 as a simple table

na(n)
00
12
296
31620
417920
5157500
61197504
78240232
852715520
9318995820
101847560000
1110328229912
1256073378816
13297051536600
141541119305600
157852824450000
1639392404439040
17194905125100620
18952671403252800

[0,2,96,1620,17920,157500,1197504,8240232,
 52715520,318995820,1847560000,10328229912,
 56073378816,297051536600,1541119305600,
 7852824450000,39392404439040,194905125100620,
 952671403252800]