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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.

A364443 a(n) is the number of integers k of the form x^2 + x*y + y^2 (A003136) with n^2 < k < (n+1)^2.

Table of values

n a(n)
0 0
1 1
2 1
3 2
4 2
5 3
6 4
7 4
8 5
9 4
10 6
11 5
12 6
13 8
14 7
15 8
16 7
17 9
18 9
19 11
20 10
21 10
22 11
23 10
24 13
25 12
26 13
27 13
28 13
29 14
30 13
31 16
32 16
33 16
34 14
35 16
36 17
37 16
38 18
39 20
40 19
41 19
42 19
43 19
44 21
45 20
46 22
47 21
48 21
49 22
50 22
51 24
52 25
53 21
54 24
55 25
56 24
57 27
58 27
59 25
60 29
61 26
62 28
63 26
64 27
65 29
66 29
67 30
68 28
69 29
70 32
71 31

List of values

[0, 1, 1, 2, 2, 3, 4, 4, 5, 4, 6, 5, 6, 8, 7, 8, 7, 9, 9, 11, 10, 10, 11, 10, 13, 12, 13, 13, 13, 14, 13, 16, 16, 16, 14, 16, 17, 16, 18, 20, 19, 19, 19, 19, 21, 20, 22, 21, 21, 22, 22, 24, 25, 21, 24, 25, 24, 27, 27, 25, 29, 26, 28, 26, 27, 29, 29, 30, 28, 29, 32, 31]

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

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