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A181934
as a simple table
n
a(n)
1
1
2
2
3
3
4
5
5
10
6
20
7
25
8
50
9
100
10
250
11
300
12
400
13
500
14
1000
15
2000
[1,2,3,5,10,20,25,50,100,250,300,400,500,1000, 2000]