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.

A374337 Start with two vertices and draw a circle around each whose radius is the distance between the vertices. The sequence gives the number of regions constructed after n iterations of drawing circles with this same radius around every new vertex created from all circles' intersections.

Table of values

n a(n)
1 3
2 11
3 27
4 55
5 99
6 145
7 203
8 277
9 353
10 441
11 545
12 651
13 769
14 903
15 1039
16 1187
17 1351
18 1517
19 1695
20 1889
21 2085
22 2293
23 2517
24 2743
25 2981
26 3235
27 3491
28 3759
29 4043
30 4329
31 4627
32 4941
33 5257
34 5585
35 5929
36 6275
37 6633
38 7007
39 7383
40 7771
41 8175
42 8581
43 8999
44 9433
45 9869
46 10317
47 10781
48 11247
49 11725
50 12219
51 12715

List of values

[3, 11, 27, 55, 99, 145, 203, 277, 353, 441, 545, 651, 769, 903, 1039, 1187, 1351, 1517, 1695, 1889, 2085, 2293, 2517, 2743, 2981, 3235, 3491, 3759, 4043, 4329, 4627, 4941, 5257, 5585, 5929, 6275, 6633, 7007, 7383, 7771, 8175, 8581, 8999, 9433, 9869, 10317, 10781, 11247, 11725, 12219, 12715]