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A265801
as a simple table
n
a(n)
1
2
2
2
3
3
4
7
5
19
6
23
7
29
8
97
9
353
10
563
11
631
12
919
13
1453
14
2207
15
15271
16
15737
17
42797
18
49939
[2,2,3,7,19,23,29,97,353,563,631,919,1453,2207, 15271,15737,42797,49939]