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A146713
as a simple table
n
a(n)
1
1
2
1
3
1
4
1
5
1
6
21
7
47
8
295
9
1465
10
7767
11
65051
12
795933
13
8973805
14
164427495
15
3016356659
16
81769439115
[1,1,1,1,1,21,47,295,1465,7767,65051,795933, 8973805,164427495,3016356659,81769439115]