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A123851
as a simple table
n
a(n)
0
1
1
1
2
2
3
24
4
55296
5
845378412871680
6
3624972460853492659595005581182702601633792000
[1,1,2,24,55296,845378412871680, 3624972460853492659595005581182702601633792000]