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A155305
as a simple table
n
a(n)
4
1
5
7
6
25
7
64
8
217
9
1298
10
10738
11
90390
12
827265
13
9950319
14
159818687
15
3209355205
16
75527888278
17
2156343784054
[1,7,25,64,217,1298,10738,90390,827265,9950319, 159818687,3209355205,75527888278,2156343784054]