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A066844
as a simple table
n
a(n)
1
25
2
40
3
50
4
64
5
80
6
100
7
125
8
160
9
200
10
250
11
320
12
400
13
500
14
640
15
800
16
1000
17
1250
18
1600
[25,40,50,64,80,100,125,160,200,250,320,400,500, 640,800,1000,1250,1600]