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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.

A316553 Number of elements of order 2 in the group SL(2, Z(n)).

Table of values

n a(n)
1 0
2 3
3 1
4 7
5 1
6 7
7 1
8 15
9 1
10 7
11 1
12 15
13 1
14 7
15 3
16 15
17 1
18 7
19 1
20 15
21 3
22 7
23 1
24 31
25 1
26 7
27 1
28 15
29 1
30 15
31 1
32 15
33 3
34 7
35 3
36 15
37 1
38 7
39 3
40 31
41 1
42 15
43 1
44 15
45 3
46 7
47 1
48 31
49 1
50 7
51 3
52 15
53 1
54 7
55 3
56 31
57 3
58 7
59 1
60 31
61 1
62 7
63 3
64 15
65 3
66 15
67 1
68 15
69 3
70 15
71 1
72 31
73 1
74 7
75 3
76 15
77 3
78 15
79 1

List of values

[0, 3, 1, 7, 1, 7, 1, 15, 1, 7, 1, 15, 1, 7, 3, 15, 1, 7, 1, 15, 3, 7, 1, 31, 1, 7, 1, 15, 1, 15, 1, 15, 3, 7, 3, 15, 1, 7, 3, 31, 1, 15, 1, 15, 3, 7, 1, 31, 1, 7, 3, 15, 1, 7, 3, 31, 3, 7, 1, 31, 1, 7, 3, 15, 3, 15, 1, 15, 3, 15, 1, 31, 1, 7, 3, 15, 3, 15, 1]

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