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A018837 formatted as a simple table:

n a(n)
0 0
1 3
2 2
3 3
4 2
5 3
6 4
7 5
8 4
9 5
10 6
11 7
12 6
13 7
14 8
15 9
16 8
17 9
18 10
19 11
20 10
21 11
22 12
23 13
24 12
25 13
26 14
27 15
28 14
29 15
30 16
31 17
32 16
33 17
34 18
35 19
36 18
37 19
38 20
39 21
40 20
41 21
42 22
43 23
44 22
45 23
46 24
47 25
48 24
49 25
50 26
51 27
52 26
53 27 

[0,3,2,3,2,3,4,5,4,5,6,7,6,7,8,9,8,9,10,11,10,11,
 12,13,12,13,14,15,14,15,16,17,16,17,18,19,18,19,
 20,21,20,21,22,23,22,23,24,25,24,25,26,27,26,27]

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Last modified December 11 12:57 EST 2009. Contains 170656 sequences.

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