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A084280
as a simple table
n
a(n)
1
1
2
2
3
8
4
64
5
1023
6
32596
7
2062592
8
257798069
9
63135260853
10
29939766625614
11
27055039857514327
[1,2,8,64,1023,32596,2062592,257798069, 63135260853,29939766625614,27055039857514327]