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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.

A211339 Number of integer pairs (x,y) such that 1 < x <= y <= n and x^2 + y^2 <= n.

Table of values

n a(n)
1 0
2 1
3 1
4 1
5 2
6 2
7 2
8 3
9 3
10 4
11 4
12 4
13 5
14 5
15 5
16 5
17 6
18 7
19 7
20 8
21 8
22 8
23 8
24 8
25 9
26 10
27 10
28 10
29 11
30 11
31 11
32 12
33 12
34 13
35 13
36 13
37 14
38 14
39 14
40 15
41 16
42 16
43 16
44 16
45 17
46 17
47 17
48 17
49 17
50 19
51 19
52 20
53 21
54 21
55 21
56 21
57 21
58 22
59 22
60 22
61 23
62 23
63 23
64 23
65 25
66 25
67 25
68 26
69 26
70 26
71 26
72 27
73 28
74 29

List of values

[0, 1, 1, 1, 2, 2, 2, 3, 3, 4, 4, 4, 5, 5, 5, 5, 6, 7, 7, 8, 8, 8, 8, 8, 9, 10, 10, 10, 11, 11, 11, 12, 12, 13, 13, 13, 14, 14, 14, 15, 16, 16, 16, 16, 17, 17, 17, 17, 17, 19, 19, 20, 21, 21, 21, 21, 21, 22, 22, 22, 23, 23, 23, 23, 25, 25, 25, 26, 26, 26, 26, 27, 28, 29]

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