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A253774
as a simple table
n
a(n)
1
1
2
3
3
15
4
81
5
327
6
357
7
685
8
831
9
861
10
1405
11
38571
12
78127
13
216487
14
546121
15
622615
[1,3,15,81,327,357,685,831,861,1405,38571,78127, 216487,546121,622615]