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A101599
as a simple table
n
a(n)
1
1
2
10
3
126
4
1287
5
12870
6
125970
7
1352078
8
84672315
9
137846528820
10
6499270398159
[1,10,126,1287,12870,125970,1352078,84672315, 137846528820,6499270398159]