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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.

A300712 Number of ways to write n as x^2 + y^2 + z^2 + w^2 with x,y,z,w nonnegative integers such that 3*x or y is a square and x - y is twice a square.

Table of values

n a(n)
0 1
1 1
2 2
3 1
4 3
5 2
6 2
7 1
8 2
9 2
10 3
11 2
12 3
13 2
14 2
15 2
16 1
17 2
18 4
19 3
20 5
21 1
22 3
23 2
24 1
25 2
26 3
27 4
28 3
29 3
30 2
31 2
32 2
33 2
34 4
35 3
36 6
37 2
38 3
39 2
40 3
41 3
42 3
43 3
44 3
45 3
46 1
47 3
48 1
49 3
50 5
51 2
52 6
53 3
54 5
55 3
56 2
57 4
58 3
59 2
60 4
61 3
62 3
63 3
64 3
65 5
66 3
67 3
68 8
69 5
70 3
71 2
72 5
73 3
74 4
75 3
76 3
77 5
78 3
79 1
80 2

List of values

[1, 1, 2, 1, 3, 2, 2, 1, 2, 2, 3, 2, 3, 2, 2, 2, 1, 2, 4, 3, 5, 1, 3, 2, 1, 2, 3, 4, 3, 3, 2, 2, 2, 2, 4, 3, 6, 2, 3, 2, 3, 3, 3, 3, 3, 3, 1, 3, 1, 3, 5, 2, 6, 3, 5, 3, 2, 4, 3, 2, 4, 3, 3, 3, 3, 5, 3, 3, 8, 5, 3, 2, 5, 3, 4, 3, 3, 5, 3, 1, 2]

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