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A108318
as a simple table
n
a(n)
1
2
2
3
3
4
4
5
5
7
6
11
7
15
8
26
9
52
10
116
11
359
12
1547
13
2465
[2,3,4,5,7,11,15,26,52,116,359,1547,2465]