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A006868
as a simple table
n
a(n)
6
1
7
0
8
1
9
1
10
1
11
2
12
3
13
6
14
9
15
15
16
45
17
59
18
188
19
399
20
827
21
2472
22
5073
23
14153
24
35489
25
85726
[1,0,1,1,1,2,3,6,9,15,45,59,188,399,827,2472,5073, 14153,35489,85726]