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A100911
as a simple table
n
a(n)
1
0
2
1
3
4
4
6
5
15
6
21
7
25
8
70
9
129
10
399
11
511
12
856
13
9574
14
14479
15
17649
16
27054
17
28296
18
32796
19
38176
[0,1,4,6,15,21,25,70,129,399,511,856,9574,14479, 17649,27054,28296,32796,38176]