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A354471
as a simple table
n
a(n)
1
4
2
3
3
4
4
6
5
5
6
9
7
6
8
10
9
12
10
9
11
10
12
20
13
9
14
13
15
16
16
25
[4,3,4,6,5,9,6,10,12,9,10,20,9,13,16,25]
