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A075218
as a simple table
n
a(n)
1
1
2
2
3
8
4
24
5
61
6
269
7
501
8
2121
9
4709
10
14978
11
26675
12
123081
13
179707
14
660366
15
1479114
[1,2,8,24,61,269,501,2121,4709,14978,26675,123081, 179707,660366,1479114]