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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.

A295820 Number of nonnegative solutions to (x,y) = 1 and x^2 + y^2 <= n.

Table of values

n a(n)
0 0
1 2
2 3
3 3
4 3
5 5
6 5
7 5
8 5
9 5
10 7
11 7
12 7
13 9
14 9
15 9
16 9
17 11
18 11
19 11
20 11
21 11
22 11
23 11
24 11
25 13
26 15
27 15
28 15
29 17
30 17
31 17
32 17
33 17
34 19
35 19
36 19
37 21
38 21
39 21
40 21
41 23
42 23
43 23
44 23
45 23
46 23
47 23
48 23
49 23
50 25
51 25
52 25
53 27
54 27
55 27
56 27
57 27
58 29
59 29
60 29
61 31
62 31
63 31
64 31
65 35
66 35
67 35
68 35
69 35
70 35

List of values

[0, 2, 3, 3, 3, 5, 5, 5, 5, 5, 7, 7, 7, 9, 9, 9, 9, 11, 11, 11, 11, 11, 11, 11, 11, 13, 15, 15, 15, 17, 17, 17, 17, 17, 19, 19, 19, 21, 21, 21, 21, 23, 23, 23, 23, 23, 23, 23, 23, 23, 25, 25, 25, 27, 27, 27, 27, 27, 29, 29, 29, 31, 31, 31, 31, 35, 35, 35, 35, 35, 35]

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

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