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A252785
as a simple table
n
a(n)
0
0
1
0
2
1
3
3
4
7
5
24
6
103
7
1565
8
602419
9
4896600938
10
5876589263966179
[0,0,1,3,7,24,103,1565,602419,4896600938, 5876589263966179]