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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.

A165919 Irregular triangle read by rows: square-full nonzero quadratic residues mod n.

Table of values

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

List of values

[4, 4, 4, 4, 4, 4, 9, 4, 9, 4, 9, 4, 9, 12, 4, 8, 9, 4, 9, 4, 9, 4, 8, 9, 16, 4, 9, 16, 4, 9, 16, 4, 9, 16, 4, 9, 16, 18, 4, 9, 12, 16, 20, 4, 8, 9, 12, 16, 18, 4, 9, 12, 16, 4, 9, 16, 24, 4, 9, 12, 16, 25, 4, 9, 16, 25, 4, 8, 9, 16, 25, 4, 9, 16, 20, 24, 25, 28, 4, 9, 16, 24, 25]

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