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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.

A259825 a(n) = 12*H(n) where H() is the Hurwitz class number.

Table of values

n a(n)
0 -1
1 0
2 0
3 4
4 6
5 0
6 0
7 12
8 12
9 0
10 0
11 12
12 16
13 0
14 0
15 24
16 18
17 0
18 0
19 12
20 24
21 0
22 0
23 36
24 24
25 0
26 0
27 16
28 24
29 0
30 0
31 36
32 36
33 0
34 0
35 24
36 30
37 0
38 0
39 48
40 24
41 0
42 0
43 12
44 48
45 0
46 0
47 60
48 40
49 0
50 0
51 24
52 24
53 0
54 0
55 48
56 48
57 0
58 0
59 36
60 48
61 0
62 0
63 60
64 42
65 0
66 0
67 12
68 48
69 0
70 0
71 84
72 36
73 0
74 0

List of values

[-1, 0, 0, 4, 6, 0, 0, 12, 12, 0, 0, 12, 16, 0, 0, 24, 18, 0, 0, 12, 24, 0, 0, 36, 24, 0, 0, 16, 24, 0, 0, 36, 36, 0, 0, 24, 30, 0, 0, 48, 24, 0, 0, 12, 48, 0, 0, 60, 40, 0, 0, 24, 24, 0, 0, 48, 48, 0, 0, 36, 48, 0, 0, 60, 42, 0, 0, 12, 48, 0, 0, 84, 36, 0, 0]

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