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A217550
as a simple table
n
a(n)
1
1
2
179
3
204
4
108
5
996
6
2934
7
81720
8
2152080
9
851040
10
271106640
11
7935621120
12
1143137318400
13
52250931532800
[1,179,204,108,996,2934,81720,2152080,851040, 271106640,7935621120,1143137318400,52250931532800]