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A221709
as a simple table
n
a(n)
1
1
2
1
3
1
4
-2
5
72
6
1944000
7
1547934105600000000
[1,1,1,-2,72,1944000,1547934105600000000]
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Last modified April 24 06:52 EDT 2024. Contains 371920 sequences. (Running on oeis4.)