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A147127
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
7
11
15
12
27
13
51
14
137
15
397
16
1327
17
4515
18
15837
19
61007
20
262125
21
1291801
[1,1,1,1,1,1,1,1,3,7,15,27,51,137,397,1327,4515, 15837,61007,262125,1291801]