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A179724
as a simple table
n
a(n)
4
0
5
120
6
720
7
3780
8
20160
9
113400
10
680400
11
4989600
12
36590400
13
273873600
14
2085283200
15
15807792000
[0,120,720,3780,20160,113400,680400,4989600, 36590400,273873600,2085283200,15807792000]