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A052447
as a simple table
n
a(n)
1
0
2
0
3
1
4
2
5
8
6
41
7
352
8
4820
9
113256
10
4602039
11
325754696
12
40348545658
[0,0,1,2,8,41,352,4820,113256,4602039,325754696, 40348545658]