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A225621 as a simple table

n a(n)
1 1
2 4
3 20
4 108
5 632
6 4060
7 28968
8 231000
9 2058096
10 20375964
11 222393800
12 2653879624
13 34365597840
14 479776469848
15 7181892528272
16 114731622081840
17 1948073992109280
18 35031456100431900
19 665075537735997960
20 13292908401187179240
21 279000321119414475600

[1,4,20,108,632,4060,28968,231000,2058096,
 20375964,222393800,2653879624,34365597840,
 479776469848,7181892528272,114731622081840,
 1948073992109280,35031456100431900,
 665075537735997960,13292908401187179240,
 279000321119414475600]

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Last modified May 9 11:57 EDT 2024. Contains 372350 sequences. (Running on oeis4.)