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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.

A221838 Number of integer Heron triangles of height n.

Table of values

n a(n)
1 0
2 0
3 2
4 2
5 2
6 2
7 2
8 6
9 6
10 2
11 2
12 20
13 2
14 2
15 20
16 12
17 2
18 6
19 2
20 20
21 20
22 2
23 2
24 56
25 6
26 2
27 12
28 20
29 2
30 20
31 2
32 20
33 20
34 2
35 20
36 56
37 2
38 2
39 20
40 56
41 2
42 20
43 2
44 20
45 56
46 2
47 2
48 110
49 6
50 6
51 20
52 20
53 2
54 12
55 20
56 56
57 20
58 2
59 2
60 182
61 2
62 2
63 56
64 30
65 20
66 20
67 2
68 20
69 20
70 20
71 2
72 156
73 2
74 2

List of values

[0, 0, 2, 2, 2, 2, 2, 6, 6, 2, 2, 20, 2, 2, 20, 12, 2, 6, 2, 20, 20, 2, 2, 56, 6, 2, 12, 20, 2, 20, 2, 20, 20, 2, 20, 56, 2, 2, 20, 56, 2, 20, 2, 20, 56, 2, 2, 110, 6, 6, 20, 20, 2, 12, 20, 56, 20, 2, 2, 182, 2, 2, 56, 30, 20, 20, 2, 20, 20, 20, 2, 156, 2, 2]

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