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A358326
as a simple table
n
a(n)
0
1
1
0
2
1
3
4
4
34
5
744
6
17585
7
688202
8
33248174
9
2144597292
10
169696358796
11
16521881847592
[1,0,1,4,34,744,17585,688202,33248174,2144597292, 169696358796,16521881847592]