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.

A333031 Number of vertices in an equilateral triangle "frame" of size n (see Comments in A328526 for definition).

Table of values

n a(n)
1 3
2 10
3 58
4 183
5 408
6 777
7 1323
8 2142
9 3276
10 4773
11 6717
12 9264
13 12507
14 16554
15 21351
16 27090
17 34047
18 42318
19 52008
20 63453
21 76566
22 91371
23 108249
24 127608
25 149487
26 173982
27 201072
28 231225
29 265002
30 302487
31 343857
32 389856
33 440175
34 494670
35 553611
36 617610
37 687477
38 763320

List of values

[3, 10, 58, 183, 408, 777, 1323, 2142, 3276, 4773, 6717, 9264, 12507, 16554, 21351, 27090, 34047, 42318, 52008, 63453, 76566, 91371, 108249, 127608, 149487, 173982, 201072, 231225, 265002, 302487, 343857, 389856, 440175, 494670, 553611, 617610, 687477, 763320]