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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.

A228441 G.f.: Sum_{k>0} -(-x)^k / (1 + x^k).

Table of values

n a(n)
1 1
2 -2
3 2
4 -1
5 2
6 -4
7 2
8 0
9 3
10 -4
11 2
12 -2
13 2
14 -4
15 4
16 1
17 2
18 -6
19 2
20 -2
21 4
22 -4
23 2
24 0
25 3
26 -4
27 4
28 -2
29 2
30 -8
31 2
32 2
33 4
34 -4
35 4
36 -3
37 2
38 -4
39 4
40 0
41 2
42 -8
43 2
44 -2
45 6
46 -4
47 2
48 2
49 3
50 -6
51 4
52 -2
53 2
54 -8
55 4
56 0
57 4
58 -4
59 2
60 -4
61 2
62 -4
63 6
64 3
65 4
66 -8
67 2
68 -2
69 4
70 -8
71 2
72 0
73 2
74 -4
75 6
76 -2
77 4

List of values

[1, -2, 2, -1, 2, -4, 2, 0, 3, -4, 2, -2, 2, -4, 4, 1, 2, -6, 2, -2, 4, -4, 2, 0, 3, -4, 4, -2, 2, -8, 2, 2, 4, -4, 4, -3, 2, -4, 4, 0, 2, -8, 2, -2, 6, -4, 2, 2, 3, -6, 4, -2, 2, -8, 4, 0, 4, -4, 2, -4, 2, -4, 6, 3, 4, -8, 2, -2, 4, -8, 2, 0, 2, -4, 6, -2, 4]

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