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A230868
as a simple table
n
a(n)
2
1
3
2
4
4
5
9
6
15
7
165
8
317
9
488442
10
976572
11
7629882822
12
15258789078
[1,2,4,9,15,165,317,488442,976572,7629882822, 15258789078]