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A087301 as a simple table

n a(n)
2 2
3 3
4 20
5 70
6 564
7 3108
8 30624
9 230256
10 2705760
11 25771680
12 352805760
13 4067556480
14 63651813120
15 861371884800
16 15176802816000
17 235775183616000
18 4620563523072000
19 81032645804544000
20 1748700390205440000

[2,3,20,70,564,3108,30624,230256,2705760,25771680,
 352805760,4067556480,63651813120,861371884800,
 15176802816000,235775183616000,4620563523072000,
 81032645804544000,1748700390205440000]

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Last modified May 15 11:36 EDT 2024. Contains 372540 sequences. (Running on oeis4.)