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A229673
as a simple table
n
a(n)
1
1
2
3
3
15
4
126
5
1667
6
31966
7
828678
8
27535826
9
1128945382
10
55473589278
11
3193471420236
12
211517309562652
[1,3,15,126,1667,31966,828678,27535826,1128945382, 55473589278,3193471420236,211517309562652]