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A322287
as a simple table
n
a(n)
1
0
2
0
3
1
4
23
5
210
6
1996
7
20661
8
205366
9
2048662
10
20502004
11
204951472
[0,0,1,23,210,1996,20661,205366,2048662,20502004, 204951472]