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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.

A330845 The number of edges inside a hexagon formed by the straight line segments mutually connecting all vertices and all points that divide the sides into n equal parts.

Table of values

n a(n)
1 42
2 708
3 4020
4 15120
5 38544
6 83136
7 169686
8 294678
9 475500
10 746340
11 1140624
12 1581612
13 2296986
14 3055734
15 3980526
16 5391264
17 7003662
18 8516346
19 11094810
20 13280970
21 16180932
22 19971282
23 24277212
24 28090218
25 33683862
26 39656604
27 45901494
28 53121744
29 62678268
30 69382632

List of values

[42, 708, 4020, 15120, 38544, 83136, 169686, 294678, 475500, 746340, 1140624, 1581612, 2296986, 3055734, 3980526, 5391264, 7003662, 8516346, 11094810, 13280970, 16180932, 19971282, 24277212, 28090218, 33683862, 39656604, 45901494, 53121744, 62678268, 69382632]

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

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