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A243320
as a simple table
n
a(n)
1
1
2
0
3
0
4
1
5
0
6
2
7
1
8
6
9
7
10
29
11
64
12
287
13
1148
14
7267
15
55997
16
620561
[1,0,0,1,0,2,1,6,7,29,64,287,1148,7267,55997, 620561]