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A297364
as a simple table
n
a(n)
1
1
2
2
3
4
4
10
5
138
6
163
7
2511
8
36943
9
408403
10
9869857
11
11051023
[1,2,4,10,138,163,2511,36943,408403,9869857, 11051023]