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A304124
as a simple table
n
a(n)
1
1
2
2
3
4
4
10
5
29
6
120
7
685
8
6431
9
103164
10
2894632
11
138892304
12
11118977705
13
1459412127955
[1,2,4,10,29,120,685,6431,103164,2894632, 138892304,11118977705,1459412127955]