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A147517
as a simple table
n
a(n)
1
0
2
1
3
6
4
30
5
190
6
1564
7
17075
8
226758
9
3792532
10
82116003
11
1975662890
[0,1,6,30,190,1564,17075,226758,3792532,82116003, 1975662890]