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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.

A338020 a(n) is the number of circles of positive integer area with radii less than n and greater than n - 1.

Table of values

n a(n)
1 3
2 9
3 16
4 22
5 28
6 35
7 40
8 48
9 53
10 60
11 66
12 72
13 78
14 85
15 91
16 98
17 103
18 110
19 117
20 122
21 129
22 135
23 141
24 148
25 154
26 160
27 167
28 173
29 179
30 185
31 192
32 197
33 205
34 210
35 217
36 223
37 229
38 236
39 242
40 248
41 255
42 260
43 267
44 274
45 279
46 286
47 292
48 299
49 304
50 311
51 318
52 323
53 330
54 336
55 343
56 349
57 355
58 361
59 367

List of values

[3, 9, 16, 22, 28, 35, 40, 48, 53, 60, 66, 72, 78, 85, 91, 98, 103, 110, 117, 122, 129, 135, 141, 148, 154, 160, 167, 173, 179, 185, 192, 197, 205, 210, 217, 223, 229, 236, 242, 248, 255, 260, 267, 274, 279, 286, 292, 299, 304, 311, 318, 323, 330, 336, 343, 349, 355, 361, 367]