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A147125
as a simple table
n
a(n)
1
1
2
1
3
1
4
1
5
1
6
1
7
1
8
1
9
9
10
9
11
33
12
33
13
105
14
105
15
641
16
641
17
8787
18
8787
19
211111
20
211111
21
4653287
[1,1,1,1,1,1,1,1,9,9,33,33,105,105,641,641,8787, 8787,211111,211111,4653287]