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A055534
as a simple table
n
a(n)
3
1
4
86
5
2310
6
42960
7
712320
8
11481120
9
186671520
10
3116534400
11
53907638400
12
970417324800
13
18217668268800
[1,86,2310,42960,712320,11481120,186671520, 3116534400,53907638400,970417324800, 18217668268800]