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A023988 as a simple table

n a(n)
1 1
2 2
3 4
4 4
5 4
6 6
7 8
8 6
9 7
10 8
11 11
12 11
13 11
14 11
15 12
16 10
17 12
18 11
19 15
20 13
21 13
22 18
23 18
24 17
25 16
26 17
27 19
28 17

[1,2,4,4,4,6,8,6,7,8,11,11,11,11,12,10,12,11,15,
 13,13,18,18,17,16,17,19,17]

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Last modified September 20 10:10 EDT 2019. Contains 327229 sequences. (Running on oeis4.)