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A066685
as a simple table
n
a(n)
1
1
2
2
3
3
4
789
5
40087
6
238717
7
251737
8
7847315
9
69673727
10
2283427137
11
2664260621
[1,2,3,789,40087,238717,251737,7847315,69673727, 2283427137,2664260621]