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A242212
as a simple table
n
a(n)
1
4
2
5
3
7
4
11
5
19
6
37
7
71
8
151
9
379
10
1051
11
3307
12
11483
13
44453
[4,5,7,11,19,37,71,151,379,1051,3307,11483,44453]
