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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.

A181972 Number of integer pairs (x,y) such that 0 and x*y<=floor(n/2).

Table of values

n a(n)
1 0
2 0
3 0
4 1
5 1
6 2
7 2
8 3
9 3
10 4
11 4
12 6
13 6
14 7
15 7
16 9
17 9
18 10
19 10
20 12
21 12
22 13
23 13
24 16
25 16
26 17
27 17
28 19
29 19
30 21
31 21
32 23
33 23
34 24
35 24
36 27
37 27
38 28
39 28
40 31
41 31
42 33
43 33
44 35
45 35
46 36
47 36
48 40
49 40
50 41
51 41
52 43
53 43
54 45
55 45
56 48
57 48
58 49
59 49
60 53
61 53
62 54
63 54
64 57
65 57
66 59
67 59
68 61
69 61
70 63
71 63
72 67

List of values

[0, 0, 0, 1, 1, 2, 2, 3, 3, 4, 4, 6, 6, 7, 7, 9, 9, 10, 10, 12, 12, 13, 13, 16, 16, 17, 17, 19, 19, 21, 21, 23, 23, 24, 24, 27, 27, 28, 28, 31, 31, 33, 33, 35, 35, 36, 36, 40, 40, 41, 41, 43, 43, 45, 45, 48, 48, 49, 49, 53, 53, 54, 54, 57, 57, 59, 59, 61, 61, 63, 63, 67]

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

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