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A271490
as a simple table
n
a(n)
1
1
2
2
3
3
4
4
5
5
6
6
7
7
8
7
9
8
10
9
11
10
12
10
13
11
14
11
15
12
16
13
17
13
[1,2,3,4,5,6,7,7,8,9,10,10,11,11,12,13,13]