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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.

A344657 Number of vertices formed by infinite lines when connecting all vertices and all points that divide the sides of an equilateral triangle into n equal parts.

Table of values

n a(n)
1 3
2 10
3 85
4 310
5 999
6 2299
7 4674
8 8878
9 14539
10 23116
11 35922
12 53830
13 74685
14 106957
15 140887
16 183718
17 240108
18 315997
19 392049
20 497518
21 599596
22 730762
23 888903
24 1083277
25 1257270
26 1502830
27 1760371
28 2047792
29 2362620
30 2771437
31 3129933
32 3629443
33 4107994
34 4670305
35 5245447
36 5921755

List of values

[3, 10, 85, 310, 999, 2299, 4674, 8878, 14539, 23116, 35922, 53830, 74685, 106957, 140887, 183718, 240108, 315997, 392049, 497518, 599596, 730762, 888903, 1083277, 1257270, 1502830, 1760371, 2047792, 2362620, 2771437, 3129933, 3629443, 4107994, 4670305, 5245447, 5921755]

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

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