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A198898
as a simple table
n
a(n)
1
1
2
1
3
1
4
2
5
1
6
2
7
1
8
1
9
1
10
3
11
2
12
3
13
3
14
3
15
3
16
3
17
3
18
3
19
2
20
4
[1,1,1,2,1,2,1,1,1,3,2,3,3,3,3,3,3,3,2,4]