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A320448
as a simple table
n
a(n)
1
0
2
1
3
2
4
4
5
8
6
11
7
15
8
20
9
25
10
31
11
37
12
44
13
51
14
59
15
68
[0,1,2,4,8,11,15,20,25,31,37,44,51,59,68]
