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A156499
as a simple table
n
a(n)
1
1
2
0
3
0
4
7
5
15
6
150
7
1830
8
136182
9
3730237
10
747469740
11
63910429200
[1,0,0,7,15,150,1830,136182,3730237,747469740, 63910429200]