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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.

A274586 Number of edges formed by sides and straight "chords" in a right triangle when each side is divided by vertices into n equal segments.

Table of values

n a(n)
1 3
2 21
3 132
4 429
5 1272
6 2826
7 5640
8 10461
9 17094
10 26847
11 41046
12 61041
13 84051
14 118974
15 157209
16 204393
17 264855
18 346524
19 428880
20 541683
21 654087
22 793611
23 961179
24 1167468
25 1357515
26 1615209
27 1891980
28 2198019
29 2530275
30 2957808
31 3341439
32 3860652
33 4371006
34 4959636
35 5572167
36 6277722
37 6950064
38 7859406
39 8763780
40 9722571
41 10687506
42 11934912
43 13029834
44 14450598
45 15805026
46 17250795
47 18863397
48 20763204
49 22372839
50 24450474

List of values

[3, 21, 132, 429, 1272, 2826, 5640, 10461, 17094, 26847, 41046, 61041, 84051, 118974, 157209, 204393, 264855, 346524, 428880, 541683, 654087, 793611, 961179, 1167468, 1357515, 1615209, 1891980, 2198019, 2530275, 2957808, 3341439, 3860652, 4371006, 4959636, 5572167, 6277722, 6950064, 7859406, 8763780, 9722571, 10687506, 11934912, 13029834, 14450598, 15805026, 17250795, 18863397, 20763204, 22372839, 24450474]

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

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