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A052402
as a simple table
n
a(n)
1
0
2
0
3
1
4
1
5
2
6
3
7
7
8
20
9
47
10
132
11
365
12
1032
13
3069
14
8854
15
26712
16
78830
[0,0,1,1,2,3,7,20,47,132,365,1032,3069,8854,26712, 78830]