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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.

A330317 a(n) = Sum_{i=0..n} r(i)*r(i+1), where r(n) = A004018(n) is the number of ways of writing n as a sum of two squares.

Table of values

n a(n)
0 4
1 20
2 20
3 20
4 52
5 52
6 52
7 52
8 68
9 100
10 100
11 100
12 100
13 100
14 100
15 100
16 132
17 164
18 164
19 164
20 164
21 164
22 164
23 164
24 164
25 260
26 260
27 260
28 260
29 260
30 260
31 260
32 260
33 260
34 260
35 260
36 292
37 292
38 292
39 292
40 356
41 356
42 356
43 356
44 356
45 356
46 356
47 356
48 356
49 404
50 404
51 404
52 468
53 468
54 468
55 468
56 468
57 468
58 468
59 468
60 468
61 468
62 468
63 468
64 532
65 532
66 532

List of values

[4, 20, 20, 20, 52, 52, 52, 52, 68, 100, 100, 100, 100, 100, 100, 100, 132, 164, 164, 164, 164, 164, 164, 164, 164, 260, 260, 260, 260, 260, 260, 260, 260, 260, 260, 260, 292, 292, 292, 292, 356, 356, 356, 356, 356, 356, 356, 356, 356, 404, 404, 404, 468, 468, 468, 468, 468, 468, 468, 468, 468, 468, 468, 468, 532, 532, 532]

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

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