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A320581
as a simple table
n
a(n)
1
2
2
1
3
2
4
3
5
4
6
3
7
4
8
5
9
6
10
5
11
6
12
7
13
8
14
9
15
10
[2,1,2,3,4,3,4,5,6,5,6,7,8,9,10]
