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A353907
as a simple table
n
a(n)
1
1
2
2
3
3
4
4
5
5
6
6
7
7
8
8
9
9
10
31381059609
11
1853020188851841
[1,2,3,4,5,6,7,8,9,31381059609,1853020188851841]