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A055928 as a simple table

n a(n)
1 1
2 1
3 1
4 5
5 5
6 210
7 210
8 850
9 7735
10 806806
11 806806
12 3229590
13 3229590
14 161479500
15 1455090000
16 23286770000
17 23286770000
18 838446909300
19 838446909300
20 83973923013750
21 83973923013750
22 10244818607677500
23 10244818607677500

[1,1,1,5,5,210,210,850,7735,806806,806806,3229590,
 3229590,161479500,1455090000,23286770000,
 23286770000,838446909300,838446909300,
 83973923013750,83973923013750,10244818607677500,
 10244818607677500]

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Last modified April 24 18:17 EDT 2024. Contains 371962 sequences. (Running on oeis4.)