cp's OEIS Frontend

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.

A343755 Number of regions 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 7
2 30
3 144
4 474
5 1324
6 2934
7 5797
8 10614
9 17424
10 27480
11 41845
12 61602
13 85711
14 120120
15 159213
16 207798
17 269668
18 349272
19 434878
20 545496
21 661764
22 804582
23 973471
24 1174980
25 1374646
26 1631304
27 1908768
28 2218254
29 2560198
30 2976486
31 3378985
32 3887796
33 4405671
34 4995240
35 5617689
36 6322878

List of values

[7, 30, 144, 474, 1324, 2934, 5797, 10614, 17424, 27480, 41845, 61602, 85711, 120120, 159213, 207798, 269668, 349272, 434878, 545496, 661764, 804582, 973471, 1174980, 1374646, 1631304, 1908768, 2218254, 2560198, 2976486, 3378985, 3887796, 4405671, 4995240, 5617689, 6322878]

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

Content is available under The OEIS End-User License Agreement.