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A161719
as a simple table
n
a(n)
1
4
2
4
3
10
4
40
5
990
6
8712
7
1691820
8
69466840
9
6173190532
10
4139897208540
[4,4,10,40,990,8712,1691820,69466840,6173190532, 4139897208540]
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Last modified August 24 04:58 EDT 2024. Contains 375396 sequences. (Running on oeis4.)