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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.

A335784 Irregular table read by rows: n-sect the angles of a nonagon (enneagon). Then T(n,k) = number of k-sided polygons in that figure for k >= 3.

Table of values

n a(n)
1 0
2 0
3 0
4 0
5 0
6 0
7 1
8 18
9 36
10 81
11 9
12 0
13 0
14 0
15 0
16 0
17 0
18 0
19 0
20 0
21 0
22 0
23 0
24 1
25 126
26 36
27 180
28 135
29 18
30 45
31 9
32 0
33 0
34 0
35 0
36 0
37 0
38 0
39 0
40 0
41 0
42 1
43 288
44 126
45 54
46 90
47 36
48 18
49 9
50 0
51 0
52 1
53 450
54 306
55 72
56 18
57 576
58 369
59 207
60 126
61 0
62 9
63 0
64 0
65 0
66 0
67 0
68 0
69 0
70 0
71 0
72 1

List of values

[0, 0, 0, 0, 0, 0, 1, 18, 36, 81, 9, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 126, 36, 180, 135, 18, 45, 9, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 288, 126, 54, 90, 36, 18, 9, 0, 0, 1, 450, 306, 72, 18, 576, 369, 207, 126, 0, 9, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1]

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