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A253646
as a simple table
n
a(n)
1
2
2
3
3
5
4
17
5
48989
6
5453971
7
61636943111479
8
128359315177123
9
884785266899689
10
1116777231836989
[2,3,5,17,48989,5453971,61636943111479, 128359315177123,884785266899689,1116777231836989]