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A210609
as a simple table
n
a(n)
1
0
2
0
3
0
4
1
5
1
6
1
7
1
8
2
9
2
10
3
11
3
12
4
13
4
14
5
15
5
16
6
17
6
18
6
19
6
20
7
21
7
22
8
23
14
24
21
25
27
[0,0,0,1,1,1,1,2,2,3,3,4,4,5,5,6,6,6,6,7,7,8,14, 21,27]