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A317476
as a simple table
n
a(n)
1
1
2
270
3
164989440
4
2701389600
5
71271827200
6
183694492800
7
7322605472000
8
28103080287744
[1,270,164989440,2701389600,71271827200, 183694492800,7322605472000,28103080287744]