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A147135
as a simple table
n
a(n)
1
1
2
1
3
1
4
1
5
1
6
1
7
1
8
1
9
3
10
9
11
19
12
33
13
59
14
157
15
473
16
1581
17
5917
18
23197
19
94123
20
435079
21
2125669
[1,1,1,1,1,1,1,1,3,9,19,33,59,157,473,1581,5917, 23197,94123,435079,2125669]