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A123412
as a simple table
n
a(n)
1
1
2
2
3
4
4
11
5
32
6
126
7
546
8
2766
9
15014
10
88460
11
563440
12
3988355
13
32324527
14
314549464
[1,2,4,11,32,126,546,2766,15014,88460,563440, 3988355,32324527,314549464]