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A325617 as a simple table

n a(n)
0 1
1 1
2 1
3 2
4 4
5 20
6 105
7 840
8 3960
9 51480
10 675675
11 10810800
12 139675536
13 2793510720
14 58663725120
15 1799020903680
16 26985313555200
17 782574093100800
18 25992639520848000
19 857757104187984000
20 30021498646579440000
21 1563341744336692320000
22 64179292662243158400000

[1,1,1,2,4,20,105,840,3960,51480,675675,10810800,
 139675536,2793510720,58663725120,1799020903680,
 26985313555200,782574093100800,25992639520848000,
 857757104187984000,30021498646579440000,
 1563341744336692320000,64179292662243158400000]

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Last modified September 14 15:15 EDT 2024. Contains 375921 sequences. (Running on oeis4.)