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A132297
as a simple table
n
a(n)
2
4
3
7
4
12
5
18
6
26
7
35
8
46
9
58
10
72
11
87
12
104
13
122
14
142
15
163
16
186
17
210
18
236
19
263
20
292
[4,7,12,18,26,35,46,58,72,87,104,122,142,163,186, 210,236,263,292]