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A153543
as a simple table
n
a(n)
0
1
1
2
2
8
3
64
4
1023
5
27824
6
1517143
7
160069345
8
32351867720
9
12445823725343
[1,2,8,64,1023,27824,1517143,160069345, 32351867720,12445823725343]