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A147165
as a simple table
n
a(n)
1
1
2
1
3
1
4
1
5
1
6
5
7
17
8
39
9
131
10
669
11
4577
12
33447
13
274545
[1,1,1,1,1,5,17,39,131,669,4577,33447,274545]