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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.

A224921 Number of Pythagorean triples (a, b, c) with a^2 + b^2 = c^2 and 0 < a < b < c < n.

Table of values

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

List of values

[0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 2, 2, 2, 3, 3, 4, 4, 5, 5, 5, 6, 6, 6, 6, 6, 8, 9, 9, 9, 10, 11, 11, 11, 11, 12, 13, 13, 14, 14, 15, 16, 17, 17, 17, 17, 18, 18, 18, 18, 18, 20, 21, 22, 23, 23, 24, 24, 24, 25, 25, 26, 27, 27, 27, 27, 31, 31, 31, 32, 32, 33, 33, 33]

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

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