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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.

A228131 a(n) = Sum_{i=0..n-1} K(i,n)*i, where K(,) is Kronecker symbol.

Table of values

n a(n)
1 0
2 1
3 -1
4 4
5 0
6 6
7 -7
8 0
9 27
10 6
11 -11
12 -8
13 0
14 20
15 -30
16 64
17 0
18 -4
19 -19
20 0
21 0
22 46
23 -69
24 -48
25 250
26 106
27 -9
28 0
29 0
30 68
31 -93
32 0
33 0
34 44
35 -70
36 216
37 0
38 82
39 -156
40 0
41 0
42 60
43 -43
44 -88
45 0
46 148
47 -235
48 -32
49 1029
50 94
51 -102
52 0
53 0
54 6
55 -220
56 -224
57 0
58 -82
59 -177
60 0
61 0
62 168
63 -126
64 1024
65 0
66 304
67 -67
68 0
69 0
70 268
71 -497
72 0
73 0
74 494
75 -50
76 -152
77 0
78 276
79 -395
80 0
81 2187
82 4
83 -249
84 0
85 0
86 310
87 -522
88 -176
89 0
90 388
91 -182
92 0
93 0
94 424
95 -760
96 -192
97 0
98 202
99 0
100 2000

List of values

[0, 1, -1, 4, 0, 6, -7, 0, 27, 6, -11, -8, 0, 20, -30, 64, 0, -4, -19, 0, 0, 46, -69, -48, 250, 106, -9, 0, 0, 68, -93, 0, 0, 44, -70, 216, 0, 82, -156, 0, 0, 60, -43, -88, 0, 148, -235, -32, 1029, 94, -102, 0, 0, 6, -220, -224, 0, -82, -177, 0, 0, 168, -126, 1024, 0, 304, -67, 0, 0, 268, -497, 0, 0, 494, -50, -152, 0, 276, -395, 0, 2187, 4, -249, 0, 0, 310, -522, -176, 0, 388, -182, 0, 0, 424, -760, -192, 0, 202, 0, 2000]