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A090907
as a simple table
n
a(n)
1
2
2
6
3
140
4
1287
5
2139552000
6
2949442889323392
7
322686644032484531917367528014184448000000
[2,6,140,1287,2139552000,2949442889323392, 322686644032484531917367528014184448000000]
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Last modified August 31 23:29 EDT 2024. Contains 375575 sequences. (Running on oeis4.)