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A348104
as a simple table
n
a(n)
0
1
1
2
2
6
3
20
4
96
5
646
6
7664
7
172924
8
8114872
9
781726816
10
158475666938
11
65399255831376
[1,2,6,20,96,646,7664,172924,8114872,781726816, 158475666938,65399255831376]