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A186069
as a simple table
n
a(n)
1
1
2
2
3
2
4
2
5
2177
6
16109
7
1100318
8
1315351
9
74810500
10
1130720467
11
103273582897
12
1587865798465
[1,2,2,2,2177,16109,1100318,1315351,74810500, 1130720467,103273582897,1587865798465]