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A093913
as a simple table
n
a(n)
1
6
2
20
3
42
4
1144
5
3343050
6
707866293437614080
7
322686644032484531917367528014184448000000
[6,20,42,1144,3343050,707866293437614080, 322686644032484531917367528014184448000000]
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Last modified April 17 17:01 EDT 2024. Contains 371765 sequences. (Running on oeis4.)