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A274696
as a simple table
n
a(n)
1
0
2
1
3
3
4
8
5
15
6
24
7
120
8
168
9
840
10
1680
11
5040
12
201600
13
256032000
[0,1,3,8,15,24,120,168,840,1680,5040,201600, 256032000]