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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.

A307000 Number of unitary rings with additive group (Z/nZ)^2. Equivalently, number of unitary commutative rings with additive group (Z/nZ)^2.

Table of values

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

List of values

[1, 3, 3, 6, 3, 9, 3, 10, 5, 9, 3, 18, 3, 9, 9, 14, 3, 15, 3, 18, 9, 9, 3, 30, 5, 9, 7, 18, 3, 27, 3, 18, 9, 9, 9, 30, 3, 9, 9, 30, 3, 27, 3, 18, 15, 9, 3, 42, 5, 15, 9, 18, 3, 21, 9, 30, 9, 9, 3, 54, 3, 9, 15, 22, 9, 27, 3, 18, 9, 27, 3, 50, 3, 9, 15, 18, 9, 27]

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