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A228979
as a simple table
n
a(n)
1
2
2
16
3
512
4
56472
5
20729216
6
25205141664
7
102496979446048
8
1399175578116323192
9
64226272780209688718776
[2,16,512,56472,20729216,25205141664, 102496979446048,1399175578116323192, 64226272780209688718776]