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A321728
as a simple table
n
a(n)
0
0
1
0
2
1
3
1
4
2
5
3
6
5
7
7
8
10
9
14
10
20
11
28
12
37
13
50
[0,0,1,1,2,3,5,7,10,14,20,28,37,50]