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A052448
as a simple table
n
a(n)
1
0
2
0
3
0
4
1
5
2
6
15
7
121
8
2159
9
68715
10
3952378
11
389968005
12
65161587084
[0,0,0,1,2,15,121,2159,68715,3952378,389968005, 65161587084]