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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.

A363173 Number of triangles inside a regular n-gon formed by intersecting line segments, considering all configurations of 3 line segments from 6 distinct vertices.

Table of values

n a(n)
3 0
4 0
5 0
6 0
7 7
8 16
9 84
10 180
11 462
12 796
13 1716
14 2856
15 5005
16 7744
17 12376
18 17508
19 27132
20 38160
21 54264
22 73788
23 100947
24 132216
25 177100
26 228748
27 296010
28 374808
29 475020
30 584140
31 736281
32 903168
33 1107568
34 1341232
35 1623160
36 1939308
37 2324784
38 2755380
39 3262623
40 3832080
41 4496388

List of values

[0, 0, 0, 0, 7, 16, 84, 180, 462, 796, 1716, 2856, 5005, 7744, 12376, 17508, 27132, 38160, 54264, 73788, 100947, 132216, 177100, 228748, 296010, 374808, 475020, 584140, 736281, 903168, 1107568, 1341232, 1623160, 1939308, 2324784, 2755380, 3262623, 3832080, 4496388]

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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