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.

A092867 Number of regions in an equilateral triangular figure formed by the straight line segments connecting all vertices and all points that divide the sides into n equal parts.

Table of values

n a(n)
1 1
2 12
3 75
4 252
5 715
6 1572
7 3109
8 5676
9 9291
10 14556
11 22081
12 32502
13 44935
14 62868
15 83286
16 108384
17 140152
18 181710
19 225565
20 282978
21 342792
22 415614
23 502318
24 606642
25 708505
26 839874
27 983007
28 1141416
29 1315102
30 1529526
31 1733476
32 1994550
33 2259420
34 2559990
35 2878053
36 3237414
37 3593521
38 4047906
39 4510590
40 5002350
41 5506918
42 6128100
43 6704800
44 7414518
45 8113992
46 8858622
47 9682927
48 10626774
49 11478142
50 12519492

List of values

[1, 12, 75, 252, 715, 1572, 3109, 5676, 9291, 14556, 22081, 32502, 44935, 62868, 83286, 108384, 140152, 181710, 225565, 282978, 342792, 415614, 502318, 606642, 708505, 839874, 983007, 1141416, 1315102, 1529526, 1733476, 1994550, 2259420, 2559990, 2878053, 3237414, 3593521, 4047906, 4510590, 5002350, 5506918, 6128100, 6704800, 7414518, 8113992, 8858622, 9682927, 10626774, 11478142, 12519492]

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

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