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A093002
as a simple table
n
a(n)
1
1
2
2
3
144
4
2073600
5
17557585920000
6
192668014586363904000000
7
5116462645455544976110780416000000000
[1,2,144,2073600,17557585920000, 192668014586363904000000, 5116462645455544976110780416000000000]