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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.

A366562 a(n) = Sum_{k=1..n} A366561(n,k)*A023900(k)/n.

Table of values

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

List of values

[1, 0, -2, 0, -4, 0, -6, 0, -6, 0, -10, 0, -12, 0, 8, 0, -16, 0, -18, 0, 12, 0, -22, 0, -20, 0, -18, 0, -28, 0, -30, 0, 20, 0, 24, 0, -36, 0, 24, 0, -40, 0, -42, 0, 24, 0, -46, 0, -42, 0, 32, 0, -52, 0, 40, 0, 36, 0, -58, 0, -60, 0, 36, 0, 48, 0, -66, 0, 44, 0, -70, 0, -72, 0]

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