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A056150
as a simple table
n
a(n)
3
1
4
3
5
6
6
10
7
15
8
21
9
25
10
27
11
27
12
25
13
21
14
15
15
10
16
6
17
3
18
1
[1,3,6,10,15,21,25,27,27,25,21,15,10,6,3,1]
