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A005963
as a simple table
n
a(n)
1
0
2
0
3
1
4
2
5
10
6
45
7
210
8
1002
9
4883
10
23797
11
116518
12
571471
[0,0,1,2,10,45,210,1002,4883,23797,116518,571471]