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A280981 as a simple table

n a(n)
1 1
2 1
3 1
4 1
5 3
6 6
7 30
8 120
9 720
10 4320
11 38880
12 233280
13 2566080
14 25660800
15 282268800
16 3104956800
17 46574352000
18 558892224000
19 9501167808000
20 133016349312000
21 2261277938304000
22 40703002889472000
23 854763060678912000
24 13676208970862592000
25 300876597358977024000

[1,1,1,1,3,6,30,120,720,4320,38880,233280,2566080,
 25660800,282268800,3104956800,46574352000,
 558892224000,9501167808000,133016349312000,
 2261277938304000,40703002889472000,
 854763060678912000,13676208970862592000,
 300876597358977024000]

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Last modified May 3 12:43 EDT 2024. Contains 372212 sequences. (Running on oeis4.)