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A274806
as a simple table
n
a(n)
1
1
2
0
3
0
4
48
5
960
6
92160
7
862848000
8
300286741708800
9
1835082219864832081920
[1,0,0,48,960,92160,862848000,300286741708800, 1835082219864832081920]