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A286125
as a simple table
n
a(n)
1
3
2
4
3
8
4
672
5
720
6
3960
7
25056
8
114912
9
323928
10
1064880
11
3899880
12
16758000
13
59222400
[3,4,8,672,720,3960,25056,114912,323928,1064880, 3899880,16758000,59222400]