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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.

A274585 Total number of vertices formed by intersections among 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)
0 1
1 3
2 10
3 58
4 178
5 558
6 1255
7 2532
8 4786
9 7804
10 12292
11 18966
12 28540
13 39117
14 56107
15 73924
16 96010
17 124704
18 164815
19 203316
20 258706
21 311296
22 377998
23 458862
24 560827
25 649011
26 775336
27 908974
28 1056604
29 1215174
30 1428283
31 1607964
32 1866103
33 2111587
34 2399647
35 2694115
36 3040309
37 3356544
38 3811501
39 4253191
40 4720222
41 5180589
42 5806813
43 6325035
44 7036081
45 7691035
46 8392174
47 9180471
48 10136431
49 10894698
50 11930983

List of values

[1, 3, 10, 58, 178, 558, 1255, 2532, 4786, 7804, 12292, 18966, 28540, 39117, 56107, 73924, 96010, 124704, 164815, 203316, 258706, 311296, 377998, 458862, 560827, 649011, 775336, 908974, 1056604, 1215174, 1428283, 1607964, 1866103, 2111587, 2399647, 2694115, 3040309, 3356544, 3811501, 4253191, 4720222, 5180589, 5806813, 6325035, 7036081, 7691035, 8392174, 9180471, 10136431, 10894698, 11930983]

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

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