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A241842
as a simple table
n
a(n)
1
0
2
0
3
1
4
4
5
18
6
106
7
846
8
11095
9
261056
10
11716488
11
1006700452
[0,0,1,4,18,106,846,11095,261056,11716488, 1006700452]