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A214820
as a simple table
n
a(n)
1
0
2
0
3
0
4
0
5
0
6
0
7
30
8
1155
9
29910
10
601364
11
10260804
12
156469887
[0,0,0,0,0,0,30,1155,29910,601364,10260804, 156469887]