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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.

A006641 Class number of forms with discriminant -A003657(n), or equivalently class number of imaginary quadratic field with discriminant -A003657(n).

Table of values

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

List of values

[1, 1, 1, 1, 1, 2, 1, 2, 3, 2, 3, 2, 4, 2, 1, 5, 2, 2, 4, 4, 3, 1, 4, 7, 5, 3, 4, 6, 2, 2, 8, 5, 6, 3, 8, 2, 6, 10, 4, 2, 5, 5, 4, 4, 3, 10, 2, 7, 6, 4, 10, 1, 8, 11, 4, 5, 8, 4, 2, 13, 4, 9, 4, 3, 6, 14, 4, 7, 5, 4, 12, 2]

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