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A147174
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
35
13
81
14
217
15
621
16
1903
17
7803
18
32967
19
151167
20
704477
21
3742519
22
21530169
[1,1,1,1,1,1,1,1,3,9,19,35,81,217,621,1903,7803, 32967,151167,704477,3742519,21530169]