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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.

A333168 a(n) = Sum_{k=0..n} r_2(k^2 + 1), where r_2(k) is the number of ways of writing k as a sum of 2 squares (A004018).

Table of values

n a(n)
0 4
1 8
2 16
3 24
4 32
5 40
6 48
7 60
8 76
9 84
10 92
11 100
12 116
13 132
14 140
15 148
16 156
17 172
18 196
19 204
20 212
21 228
22 244
23 260
24 268
25 276
26 284
27 300
28 316
29 324
30 340
31 356
32 380
33 396
34 412
35 420
36 428
37 444
38 468
39 476
40 484
41 496
42 512
43 536
44 552
45 560
46 576
47 608
48 624
49 632
50 648
51 656
52 672
53 688
54 696

List of values

[4, 8, 16, 24, 32, 40, 48, 60, 76, 84, 92, 100, 116, 132, 140, 148, 156, 172, 196, 204, 212, 228, 244, 260, 268, 276, 284, 300, 316, 324, 340, 356, 380, 396, 412, 420, 428, 444, 468, 476, 484, 496, 512, 536, 552, 560, 576, 608, 624, 632, 648, 656, 672, 688, 696]

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

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