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A007034
as a simple table
n
a(n)
1
0
2
0
3
0
4
0
5
0
6
0
7
1
8
2
9
8
10
35
11
168
12
999
13
6340
14
43133
15
305271
16
2231377
[0,0,0,0,0,0,1,2,8,35,168,999,6340,43133,305271, 2231377]