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A301602
as a simple table
n
a(n)
1
1
2
2
3
2
4
25
5
330
6
8888
7
591585
8
83224304
9
23865691820
10
14092825824108
[1,2,2,25,330,8888,591585,83224304,23865691820, 14092825824108]