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A004401
as a simple table
n
a(n)
1
0
2
1
3
2
4
4
5
6
6
8
7
11
8
13
9
16
10
18
[0,1,2,4,6,8,11,13,16,18]
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Last modified August 21 16:16 EDT 2024. Contains 375353 sequences. (Running on oeis4.)