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A083369
as a simple table
n
a(n)
1
1
2
2
3
3
4
7
5
43
6
139
7
50207
8
340999
9
2365347734339
10
4680225641471129
11
1368845206580129
[1,2,3,7,43,139,50207,340999,2365347734339, 4680225641471129,1368845206580129]