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A273916
as a simple table
n
a(n)
0
0
1
4
2
7
3
9
4
11
5
12
6
12
7
14
8
15
9
16
10
16
11
18
12
19
13
20
14
22
15
24
[0,4,7,9,11,12,12,14,15,16,16,18,19,20,22,24]