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A337526
as a simple table
n
a(n)
1
1
2
2
3
5
4
15
5
50
6
180
7
686
8
2731
[1,2,5,15,50,180,686,2731]
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Last modified August 30 04:22 EDT 2024. Contains 375524 sequences. (Running on oeis4.)