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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.

A368814 Number of vertices in a regular 2n-gon when all vertices are connect by straight lines except for the n lines joining diametrically opposite vertices.

Table of values

n a(n)
1 2
2 4
3 12
4 48
5 150
6 288
7 728
8 1344
9 1782
10 3780
11 5852
12 7224
13 12350
14 17108
15 16620
16 30720
17 40018
18 46728
19 64676
20 80560
21 84462
22 121044
23 146280
24 163728
25 208250
26 245700
27 271836
28 335664
29 389006
30 404400
31 514352
32 587264
33 638022
34 756228
35 853300
36 933480
37 1074998
38 1200724
39 1295112
40 1485120
41 1645002

List of values

[2, 4, 12, 48, 150, 288, 728, 1344, 1782, 3780, 5852, 7224, 12350, 17108, 16620, 30720, 40018, 46728, 64676, 80560, 84462, 121044, 146280, 163728, 208250, 245700, 271836, 335664, 389006, 404400, 514352, 587264, 638022, 756228, 853300, 933480, 1074998, 1200724, 1295112, 1485120, 1645002]

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

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