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.

A277402 "3-Portolan numbers": number of regions formed by n-secting the angles of an equilateral triangle.

Table of values

n a(n)
1 1
2 6
3 19
4 30
5 61
6 78
7 127
8 150
9 217
10 234
11 331
12 366
13 469
14 510
15 631
16 678
17 817
18 870
19 1027
20 1074
21 1261
22 1326
23 1519
24 1590
25 1801
26 1878
27 2107
28 2190
29 2437
30 2514
31 2791
32 2886
33 3169
34 3270
35 3571
36 3678
37 3997
38 4110
39 4447
40 4554
41 4921
42 5046
43 5419
44 5550
45 5941
46 6078
47 6487
48 6630
49 7057
50 7194

List of values

[1, 6, 19, 30, 61, 78, 127, 150, 217, 234, 331, 366, 469, 510, 631, 678, 817, 870, 1027, 1074, 1261, 1326, 1519, 1590, 1801, 1878, 2107, 2190, 2437, 2514, 2791, 2886, 3169, 3270, 3571, 3678, 3997, 4110, 4447, 4554, 4921, 5046, 5419, 5550, 5941, 6078, 6487, 6630, 7057, 7194]

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

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