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A073584 as a simple table

n a(n)
1 1
2 1
3 9
4 48
5 300
6 2520
7 22680
8 282240
9 3265920
10 43545600
11 618710400
12 10298534400
13 171243072000
14 3138418483200
15 61460695296000
16 1286751578112000
17 27743619391488000
18 640237370572800000
19 15448927751921664000
20 394130125324615680000
21 10422552203028725760000
22 288306186674956369920000

[1,1,9,48,300,2520,22680,282240,3265920,43545600,
 618710400,10298534400,171243072000,3138418483200,
 61460695296000,1286751578112000,27743619391488000,
 640237370572800000,15448927751921664000,
 394130125324615680000,10422552203028725760000,
 288306186674956369920000]

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Last modified May 26 20:51 EDT 2022. Contains 354092 sequences. (Running on oeis4.)