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A090515
as a simple table
n
a(n)
1
1
2
4
3
8
4
9
5
16
6
25
7
27
8
32
9
36
10
49
11
64
12
81
13
125
14
128
15
169
16
196
17
216
18
243
19
256
20
289
21
324
[1,4,8,9,16,25,27,32,36,49,64,81,125,128,169,196, 216,243,256,289,324]