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A165200
as a simple table
n
a(n)
0
1
1
1
2
1
3
3
4
6
5
18
6
58
7
251
8
1410
9
10311
10
98577
11
1246488
12
20837439
13
466087635
[1,1,1,3,6,18,58,251,1410,10311,98577,1246488, 20837439,466087635]