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A182131
as a simple table
n
a(n)
1
0
2
4
3
6
4
8
5
11
6
13
7
17
8
21
9
24
10
27
11
31
12
37
13
41
14
46
15
51
[0,4,6,8,11,13,17,21,24,27,31,37,41,46,51]