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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.

A244209 The total number of unit circles (centered at sites of a square lattice with constant 2) intersecting a circle of radius n centered at (0,0).

Table of values

n a(n)
1 0
2 8
3 4
4 12
5 12
6 16
7 16
8 32
9 20
10 28
11 28
12 40
13 32
14 40
15 44
16 48
17 52
18 68
19 52
20 56
21 56
22 72
23 60
24 68
25 76
26 88
27 80
28 88
29 84
30 84
31 84
32 112
33 92
34 112
35 104
36 112
37 116
38 116
39 116
40 112
41 112
42 144
43 140
44 140
45 132
46 144
47 136
48 144
49 148
50 168
51 148
52 164
53 164
54 160
55 160
56 184
57 164
58 172
59 180
60 200
61 176
62 192
63 204

List of values

[0, 8, 4, 12, 12, 16, 16, 32, 20, 28, 28, 40, 32, 40, 44, 48, 52, 68, 52, 56, 56, 72, 60, 68, 76, 88, 80, 88, 84, 84, 84, 112, 92, 112, 104, 112, 116, 116, 116, 112, 112, 144, 140, 140, 132, 144, 136, 144, 148, 168, 148, 164, 164, 160, 160, 184, 164, 172, 180, 200, 176, 192, 204]

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

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