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A230890
as a simple table
n
a(n)
0
0
1
1
2
1
3
7
4
72
5
962
6
16135
7
330624
8
8117752
9
235133003
10
7929041828
[0,1,1,7,72,962,16135,330624,8117752,235133003, 7929041828]