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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.

A060831 a(n) = Sum_{k=1..n} (number of odd divisors of k) (cf. A001227).

Table of values

n a(n)
0 0
1 1
2 2
3 4
4 5
5 7
6 9
7 11
8 12
9 15
10 17
11 19
12 21
13 23
14 25
15 29
16 30
17 32
18 35
19 37
20 39
21 43
22 45
23 47
24 49
25 52
26 54
27 58
28 60
29 62
30 66
31 68
32 69
33 73
34 75
35 79
36 82
37 84
38 86
39 90
40 92
41 94
42 98
43 100
44 102
45 108
46 110
47 112
48 114
49 117
50 120
51 124
52 126
53 128
54 132
55 136
56 138
57 142
58 144
59 146
60 150
61 152
62 154
63 160

List of values

[0, 1, 2, 4, 5, 7, 9, 11, 12, 15, 17, 19, 21, 23, 25, 29, 30, 32, 35, 37, 39, 43, 45, 47, 49, 52, 54, 58, 60, 62, 66, 68, 69, 73, 75, 79, 82, 84, 86, 90, 92, 94, 98, 100, 102, 108, 110, 112, 114, 117, 120, 124, 126, 128, 132, 136, 138, 142, 144, 146, 150, 152, 154, 160]

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

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