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A327794
as a simple table
n
a(n)
1
0
2
0
3
6
4
23
5
61
6
171
7
497
8
1471
9
4389
10
13139
11
39385
12
118119
13
354317
[0,0,6,23,61,171,497,1471,4389,13139,39385,118119, 354317]