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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.

A127173 T(n,k) = A007427(n/k) if k divides n, T(n,k) = 0 otherwise.

Table of values

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

List of values

[1, -2, 1, -2, 0, 1, 1, -2, 0, 1, -2, 0, 0, 0, 1, 4, -2, -2, 0, 0, 1, -2, 0, 0, 0, 0, 0, 1, 0, 1, 0, -2, 0, 0, 0, 1, 1, 0, -2, 0, 0, 0, 0, 0, 1, 4, -2, 0, 0, -2, 0, 0, 0, 0, 1, -2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, -2, 4, 1, -2, 0, -2, 0, 0, 0, 0, 0, 1]

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