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A181597
as a simple table
n
a(n)
1
6
2
12
3
88
4
1888
5
32128
6
521728
7
1848964
8
8378368
9
34359083008
10
549753192448
[6,12,88,1888,32128,521728,1848964,8378368, 34359083008,549753192448]