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A242792
as a simple table
n
a(n)
1
1
2
1
3
2
4
6
5
15
6
60
7
273
8
1769
9
14836
10
174111
11
2810354
12
62810605
[1,1,2,6,15,60,273,1769,14836,174111,2810354, 62810605]