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A062962
as a simple table
n
a(n)
0
1
1
1
2
2
3
4
4
12
5
40
6
160
7
792
8
9408
9
783360
10
55987200
11
35610624000
12
269007298560000
[1,1,2,4,12,40,160,792,9408,783360,55987200, 35610624000,269007298560000]