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A155298
as a simple table
n
a(n)
4
1
5
7
6
25
7
55
8
229
9
1191
10
8727
11
74357
12
700043
13
7963463
14
116098934
15
2137593164
16
48102627816
[1,7,25,55,229,1191,8727,74357,700043,7963463, 116098934,2137593164,48102627816]