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A240973
as a simple table
n
a(n)
1
1
2
1
3
2
4
4
5
14
6
120
7
3222
8
271287
9
64154817
10
41653775052
11
74220906305025
12
364602274426789164
[1,1,2,4,14,120,3222,271287,64154817,41653775052, 74220906305025,364602274426789164]