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A243023
as a simple table
n
a(n)
1
1
2
2
3
3
4
4
5
5
6
6
7
7
8
8
9
9
10
63
11
448
12
1547
13
1693
14
6189068
15
20443796
16
67526389
[1,2,3,4,5,6,7,8,9,63,448,1547,1693,6189068, 20443796,67526389]