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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.

A333848 a(n) gives the sum of the odd numbers of the smallest nonnegative reduced residue system modulo 2*n + 1, for n >= 0.

Table of values

n a(n)
0 0
1 1
2 4
3 9
4 13
5 25
6 36
7 32
8 64
9 81
10 66
11 121
12 124
13 121
14 196
15 225
16 170
17 216
18 324
19 240
20 400
21 441
22 272
23 529
24 513
25 416
26 676
27 560
28 522
29 841
30 900
31 570
32 792
33 1089
34 770
35 1225
36 1296
37 752
38 1170
39 1521
40 1093
41 1681
42 1376
43 1232
44 1936
45 1656
46 1410
47 1728
48 2304
49 1490
50 2500

List of values

[0, 1, 4, 9, 13, 25, 36, 32, 64, 81, 66, 121, 124, 121, 196, 225, 170, 216, 324, 240, 400, 441, 272, 529, 513, 416, 676, 560, 522, 841, 900, 570, 792, 1089, 770, 1225, 1296, 752, 1170, 1521, 1093, 1681, 1376, 1232, 1936, 1656, 1410, 1728, 2304, 1490, 2500]