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A056723
as a simple table
n
a(n)
1
1
2
7
3
23
4
29
5
133
6
173
7
367
8
1925
9
3707
10
5765
11
9709
12
19573
13
43753
[1,7,23,29,133,173,367,1925,3707,5765,9709,19573, 43753]