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A096743
as a simple table
n
a(n)
0
1
1
1
2
5
3
35
4
135
5
1755
6
6303
7
39815
8
132675
9
3322515
10
10561455
11
64566253
12
199681945
13
2391238415
14
7233344915
[1,1,5,35,135,1755,6303,39815,132675,3322515, 10561455,64566253,199681945,2391238415,7233344915]