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A220120
as a simple table
n
a(n)
1
2
2
7
3
12
4
18
5
20
6
24
7
26
8
29
9
41
10
53
11
72
12
107
13
137
14
152
15
158
16
314
17
1007
18
1097
19
1763
[2,7,12,18,20,24,26,29,41,53,72,107,137,152,158, 314,1007,1097,1763]