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A000897 as a simple table

n a(n)
0 1
1 12
2 420
3 18480
4 900900
5 46558512
6 2498640144
7 137680171200
8 7735904619300
9 441233078286000
10 25467973278667920
11 1484298740174927040
12 87202550985276963600
13 5157850293780050462400
14 306839461354466267304000

[1,12,420,18480,900900,46558512,2498640144,
 137680171200,7735904619300,441233078286000,
 25467973278667920,1484298740174927040,
 87202550985276963600,5157850293780050462400,
 306839461354466267304000]

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Last modified April 22 12:36 EDT 2021. Contains 343177 sequences. (Running on oeis4.)