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A028308
as a simple table
n
a(n)
1
1
2
6
3
48
4
4320
5
46448640
6
10835538739200000
7
2672817951712314077919313920000000
[1,6,48,4320,46448640,10835538739200000, 2672817951712314077919313920000000]