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A002884 as a simple table

n a(n)
0 1
1 1
2 6
3 168
4 20160
5 9999360
6 20158709760
7 163849992929280
8 5348063769211699200
9 699612310033197642547200
10 366440137299948128422802227200
11 768105432118265670534631586896281600

[1,1,6,168,20160,9999360,20158709760,
 163849992929280,5348063769211699200,
 699612310033197642547200,
 366440137299948128422802227200,
 768105432118265670534631586896281600]

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Last modified July 14 16:04 EDT 2020. Contains 335729 sequences. (Running on oeis4.)