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A018433
as a simple table
n
a(n)
1
1
2
2
3
4
4
5
5
8
6
10
7
16
8
20
9
25
10
40
11
50
12
80
13
100
14
200
15
400
[1,2,4,5,8,10,16,20,25,40,50,80,100,200,400]