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A147500
as a simple table
n
a(n)
1
1
2
1
3
1
4
1
5
1
6
3
7
9
8
19
9
37
10
159
11
849
12
4243
13
19707
14
136969
15
1272775
16
12839957
[1,1,1,1,1,3,9,19,37,159,849,4243,19707,136969, 1272775,12839957]