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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.

A330318 a(n) = Sum_{i=0..n} r(i)*r(i+1)/4, 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 1
1 5
2 5
3 5
4 13
5 13
6 13
7 13
8 17
9 25
10 25
11 25
12 25
13 25
14 25
15 25
16 33
17 41
18 41
19 41
20 41
21 41
22 41
23 41
24 41
25 65
26 65
27 65
28 65
29 65
30 65
31 65
32 65
33 65
34 65
35 65
36 73
37 73
38 73
39 73
40 89
41 89
42 89
43 89
44 89
45 89
46 89
47 89
48 89
49 101
50 101
51 101
52 117
53 117
54 117
55 117
56 117
57 117
58 117
59 117
60 117
61 117

List of values

[1, 5, 5, 5, 13, 13, 13, 13, 17, 25, 25, 25, 25, 25, 25, 25, 33, 41, 41, 41, 41, 41, 41, 41, 41, 65, 65, 65, 65, 65, 65, 65, 65, 65, 65, 65, 73, 73, 73, 73, 89, 89, 89, 89, 89, 89, 89, 89, 89, 101, 101, 101, 117, 117, 117, 117, 117, 117, 117, 117, 117, 117]

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

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