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A193285
as a simple table
n
a(n)
0
0
1
0
2
0
3
1
4
12
5
89
6
645
7
4862
8
39906
9
361931
10
3626663
11
39912033
[0,0,0,1,12,89,645,4862,39906,361931,3626663, 39912033]
