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A015871
as a simple table
n
a(n)
1
1
2
4
3
9
4
16
5
18
6
64
7
81
8
729
9
4096
10
59049
11
125316
12
262144
13
16777216
[1,4,9,16,18,64,81,729,4096,59049,125316,262144, 16777216]