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A156800
as a simple table
n
a(n)
1
1
2
1
3
2
4
4
5
10
6
35
7
134
8
777
9
6702
10
104825
11
3370317
12
231557290
[1,1,2,4,10,35,134,777,6702,104825,3370317, 231557290]