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A038168
as a simple table
n
a(n)
1
1
2
1
3
1
4
4
5
10
6
39
7
160
8
726
9
3344
10
16004
11
77323
12
379117
13
1874540
[1,1,1,4,10,39,160,726,3344,16004,77323,379117, 1874540]