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A331536
as a simple table
n
a(n)
1
1
2
3
3
6
4
11
5
25
6
69
7
282
8
1730
9
15885
10
210105
11
3986987
12
106053474
[1,3,6,11,25,69,282,1730,15885,210105,3986987, 106053474]