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A180237
as a simple table
n
a(n)
1
1
2
12
3
960
4
337680
5
367597440
6
755465356800
7
3208061483827200
8
23775433137840384000
[1,12,960,337680,367597440,755465356800, 3208061483827200,23775433137840384000]