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A146729
as a simple table
n
a(n)
1
1
2
1
3
1
4
1
5
17
6
35
7
131
8
817
9
4781
10
41379
11
493009
12
5930505
13
104085935
14
2108933179
[1,1,1,1,17,35,131,817,4781,41379,493009,5930505, 104085935,2108933179]