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A147122
as a simple table
n
a(n)
1
1
2
1
3
1
4
1
5
1
6
5
7
25
8
83
9
469
10
2129
11
11813
12
86099
13
830451
14
8876513
15
123941743
16
2095230143
[1,1,1,1,1,5,25,83,469,2129,11813,86099,830451, 8876513,123941743,2095230143]