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A198003
as a simple table
n
a(n)
1
1
2
1
3
1
4
25
5
31
6
73
7
37487
8
151968
9
2529733
10
1741375327
11
89777954615
[1,1,1,25,31,73,37487,151968,2529733,1741375327, 89777954615]