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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.

A333572 a(n) is the number of Gaussian integers z with 0 < |z| <= n/2.

Table of values

n a(n)
1 0
2 4
3 8
4 12
5 20
6 28
7 36
8 48
9 68
10 80
11 96
12 112
13 136
14 148
15 176
16 196
17 224
18 252
19 292
20 316
21 348
22 376
23 420
24 440
25 488
26 528
27 576
28 612
29 664
30 708
31 748
32 796
33 860
34 900
35 972
36 1008
37 1084
38 1128
39 1200
40 1256
41 1312
42 1372
43 1456
44 1516
45 1596
46 1652
47 1740
48 1792
49 1884
50 1960
51 2052
52 2120

List of values

[0, 4, 8, 12, 20, 28, 36, 48, 68, 80, 96, 112, 136, 148, 176, 196, 224, 252, 292, 316, 348, 376, 420, 440, 488, 528, 576, 612, 664, 708, 748, 796, 860, 900, 972, 1008, 1084, 1128, 1200, 1256, 1312, 1372, 1456, 1516, 1596, 1652, 1740, 1792, 1884, 1960, 2052, 2120]

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

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