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.

A244147 Number of hexagons (side length 1) that intersect the circumference of a circle of radius n centered at a lattice point.

Table of values

n a(n)
1 3
2 9
3 12
4 15
5 21
6 24
7 27
8 39
9 42
10 39
11 51
12 54
13 51
14 63
15 66
16 69
17 81
18 78
19 75
20 99
21 96
22 93
23 105
24 114
25 105
26 123
27 120
28 117
29 141
30 138
31 129
32 147
33 156
34 153
35 159
36 162
37 159
38 177
39 180
40 171
41 201
42 192
43 183
44 201
45 204
46 201
47 219
48 216
49 207
50 237
51 240
52 225
53 249
54 258
55 243
56 267
57 246
58 261
59 285
60 276

List of values

[3, 9, 12, 15, 21, 24, 27, 39, 42, 39, 51, 54, 51, 63, 66, 69, 81, 78, 75, 99, 96, 93, 105, 114, 105, 123, 120, 117, 141, 138, 129, 147, 156, 153, 159, 162, 159, 177, 180, 171, 201, 192, 183, 201, 204, 201, 219, 216, 207, 237, 240, 225, 249, 258, 243, 267, 246, 261, 285, 276]