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A217040
as a simple table
n
a(n)
1
3
2
4
3
5
4
9
5
10
6
15
7
244
8
676
9
14870
10
23526
11
35732
12
47133
13
66878
[3,4,5,9,10,15,244,676,14870,23526,35732,47133, 66878]