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A004060
as a simple table
n
a(n)
1
3
2
7
3
13
4
71
5
103
6
541
7
1019
8
1367
9
1627
10
4177
11
9011
12
9551
[3,7,13,71,103,541,1019,1367,1627,4177,9011,9551]