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A194501
as a simple table
n
a(n)
1
4
2
64
3
4160
4
1048560
5
1073741824
6
4398046511104
7
72057594037927936
[4,64,4160,1048560,1073741824,4398046511104, 72057594037927936]
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Last modified April 24 22:17 EDT 2024. Contains 371964 sequences. (Running on oeis4.)