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A267647
as a simple table
n
a(n)
0
4
1
8
2
9
3
10
4
11
5
11
6
11
7
11
8
11
9
11
10
11
11
10
12
9
13
8
14
7
15
6
16
5
17
4
18
3
19
2
20
1
21
0
[4,8,9,10,11,11,11,11,11,11,11,10,9,8,7,6,5,4,3,2, 1,0]