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A352801
as a simple table
n
a(n)
0
1
1
1
2
2
3
4
4
16
5
170
6
360
7
840
8
82320
9
181440
10
1512000
11
19958400
12
79833600
13
259459200
14
14529715200
[1,1,2,4,16,170,360,840,82320,181440,1512000, 19958400,79833600,259459200,14529715200]