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A121892 as a simple table

na(n)
01
12
24
324
4192
51920
623040
7322560
85160960
992897280
101857945600
1140874803200
12980995276800

[1,2,4,24,192,1920,23040,322560,5160960,92897280,
 1857945600,40874803200,980995276800]