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A360921
as a simple table
n
a(n)
1
1
2
3
3
7
4
12
5
19
6
26
7
36
8
46
9
59
10
72
11
87
12
102
13
120
14
138
15
159
[1,3,7,12,19,26,36,46,59,72,87,102,120,138,159]