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A147172
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
81
14
81
15
501
16
501
17
9129
18
9129
19
252307
20
252307
21
4894765
22
4894765
[1,1,1,1,1,1,1,1,9,9,33,33,81,81,501,501,9129, 9129,252307,252307,4894765,4894765]