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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.

A307531 a(n) is the greatest sum i + j + k + l where i^2 + j^2 + k^2 + l^2 = n and 0 <= i <= j <= k <= l.

Table of values

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

List of values

[0, 1, 2, 3, 4, 3, 4, 5, 4, 5, 6, 5, 6, 7, 6, 7, 8, 7, 8, 7, 8, 9, 8, 9, 8, 9, 10, 9, 10, 9, 10, 11, 8, 11, 10, 11, 12, 11, 12, 11, 12, 11, 12, 13, 12, 13, 12, 13, 12, 13, 14, 13, 14, 13, 14, 13, 12, 15, 14, 15, 14, 15, 14, 15, 16, 15, 16, 15, 16, 15, 16, 15]

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