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A252787
as a simple table
n
a(n)
0
0
1
0
2
1
3
3
4
7
5
28
6
131
7
26465
8
2832610615
9
18602165186505644
10
1577146952504975321253720851
[0,0,1,3,7,28,131,26465,2832610615, 18602165186505644,1577146952504975321253720851]