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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.

A317990 Number of genera of real quadratic field Q(sqrt(k)), k squarefree > 1.

Table of values

n a(n)
2 1
3 2
4 1
5 2
6 2
7 2
8 2
9 1
10 2
11 4
12 1
13 2
14 2
15 2
16 2
17 2
18 1
19 4
20 2
21 2
22 2
23 4
24 1
25 2
26 4
27 1
28 4
29 2
30 2
31 2
32 4
33 1
34 4
35 2
36 2
37 2
38 1
39 2
40 2
41 4
42 2
43 2
44 4
45 2
46 1
47 2
48 2
49 4
50 2
51 2
52 2
53 2
54 2
55 4
56 1
57 4
58 2
59 2
60 4
61 1
62 1
63 4
64 2
65 4
66 2
67 2
68 1
69 4
70 4
71 1
72 4
73 4
74 2
75 4
76 2
77 4
78 2
79 2
80 4
81 2
82 2
83 2
84 1
85 4
86 2
87 2
88 2

List of values

[1, 2, 1, 2, 2, 2, 2, 1, 2, 4, 1, 2, 2, 2, 2, 2, 1, 4, 2, 2, 2, 4, 1, 2, 4, 1, 4, 2, 2, 2, 4, 1, 4, 2, 2, 2, 1, 2, 2, 4, 2, 2, 4, 2, 1, 2, 2, 4, 2, 2, 2, 2, 2, 4, 1, 4, 2, 2, 4, 1, 1, 4, 2, 4, 2, 2, 1, 4, 4, 1, 4, 4, 2, 4, 2, 4, 2, 2, 4, 2, 2, 2, 1, 4, 2, 2, 2]

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