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A047756
as a simple table
n
a(n)
0
0
1
0
2
1
3
2
4
2
5
7
6
12
7
29
8
55
9
143
10
271
11
728
12
1428
13
3873
14
7752
15
21318
16
43256
17
120175
[0,0,1,2,2,7,12,29,55,143,271,728,1428,3873,7752, 21318,43256,120175]