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A125721 as a simple table

n a(n)
0 2
1 2
2 2
3 3
4 6
5 15
6 48
7 168
8 840
9 4536
10 26880
11 147840
12 1209600
13 7862400
14 67267200
15 648648000
16 7783776000
17 66162096000
18 871782912000
19 8281937664000
20 118562476032000
21 1680623097753600
22 23416681828700160
23 269291841030051840
24 5109094217170944000

[2,2,2,3,6,15,48,168,840,4536,26880,147840,
 1209600,7862400,67267200,648648000,7783776000,
 66162096000,871782912000,8281937664000,
 118562476032000,1680623097753600,
 23416681828700160,269291841030051840,
 5109094217170944000]

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Last modified April 19 16:08 EDT 2024. Contains 371794 sequences. (Running on oeis4.)