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A136378
as a simple table
n
a(n)
0
2
1
2
2
3
3
4
4
5
5
5
6
5
7
7
8
7
9
10
10
15
11
10
12
10
13
12
14
15
15
11
[2,2,3,4,5,5,5,7,7,10,15,10,10,12,15,11]