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A326207
as a simple table
n
a(n)
0
1
1
0
2
2
3
7
4
54
5
806
6
22690
7
1200396
8
116759344
9
20965139168
10
6954959632776
11
4363203307789888
[1,0,2,7,54,806,22690,1200396,116759344, 20965139168,6954959632776,4363203307789888]