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A092752
as a simple table
n
a(n)
1
1
2
2
3
4
4
5
5
8
6
30
7
1000
8
2000
9
4000
10
5000
11
8000
12
30000
13
1000000
14
1000000000000
[1,2,4,5,8,30,1000,2000,4000,5000,8000,30000, 1000000,1000000000000]