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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.

A127899 Transform related to the harmonic series.

Table of values

n a(n)
1 1
2 -2
3 2
4 0
5 -3
6 3
7 0
8 0
9 -4
10 4
11 0
12 0
13 0
14 -5
15 5
16 0
17 0
18 0
19 0
20 -6
21 6
22 0
23 0
24 0
25 0
26 0
27 -7
28 7
29 0
30 0
31 0
32 0
33 0
34 0
35 -8
36 8
37 0
38 0
39 0
40 0
41 0
42 0
43 0
44 -9
45 9
46 0
47 0
48 0
49 0
50 0
51 0
52 0
53 0
54 -10
55 10
56 0
57 0
58 0
59 0
60 0
61 0
62 0
63 0
64 0
65 -11
66 11
67 0
68 0
69 0
70 0
71 0
72 0
73 0
74 0
75 0
76 0
77 -12
78 12

List of values

[1, -2, 2, 0, -3, 3, 0, 0, -4, 4, 0, 0, 0, -5, 5, 0, 0, 0, 0, -6, 6, 0, 0, 0, 0, 0, -7, 7, 0, 0, 0, 0, 0, 0, -8, 8, 0, 0, 0, 0, 0, 0, 0, -9, 9, 0, 0, 0, 0, 0, 0, 0, 0, -10, 10, 0, 0, 0, 0, 0, 0, 0, 0, 0, -11, 11, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, -12, 12]

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