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A360867
as a simple table
n
a(n)
1
0
2
0
3
1
4
1
5
2
6
6
7
12
8
32
9
92
10
273
11
869
12
2989
13
10722
14
40599
[0,0,1,1,2,6,12,32,92,273,869,2989,10722,40599]