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This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A216200 Number of disjoint trees that appear while iterating the sum of divisors function up to n.

Table of values

n a(n)
1 1
2 2
3 2
4 2
5 3
6 3
7 3
8 3
9 4
10 5
11 6
12 5
13 5
14 5
15 5
16 6
17 7
18 6
19 7
20 7
21 8
22 9
23 10
24 8
25 9
26 10
27 11
28 11
29 12
30 12
31 11
32 10
33 11
34 12
35 13
36 13
37 14
38 14
39 14
40 14
41 15
42 13
43 14
44 14
45 15
46 16
47 17
48 15
49 16
50 17
51 18
52 19
53 20
54 19
55 20
56 19
57 19
58 20
59 21
60 19
61 20
62 20
63 20
64 21
65 22
66 23
67 24
68 24
69 25
70 26
71 27

List of values

[1, 2, 2, 2, 3, 3, 3, 3, 4, 5, 6, 5, 5, 5, 5, 6, 7, 6, 7, 7, 8, 9, 10, 8, 9, 10, 11, 11, 12, 12, 11, 10, 11, 12, 13, 13, 14, 14, 14, 14, 15, 13, 14, 14, 15, 16, 17, 15, 16, 17, 18, 19, 20, 19, 20, 19, 19, 20, 21, 19, 20, 20, 20, 21, 22, 23, 24, 24, 25, 26, 27]

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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