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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.

A215205 a(n) = (-1)^n * (A060819(n) + A060819(n+1)).

Table of values

n a(n)
0 1
1 -2
2 4
3 -4
4 6
5 -8
6 10
7 -9
8 11
9 -14
10 16
11 -14
12 16
13 -20
14 22
15 -19
16 21
17 -26
18 28
19 -24
20 26
21 -32
22 34
23 -29
24 31
25 -38
26 40
27 -34
28 36
29 -44
30 46
31 -39
32 41
33 -50
34 52
35 -44
36 46
37 -56
38 58
39 -49
40 51
41 -62
42 64
43 -54
44 56
45 -68
46 70
47 -59
48 61
49 -74
50 76
51 -64
52 66
53 -80
54 82
55 -69
56 71
57 -86
58 88
59 -74
60 76
61 -92
62 94
63 -79
64 81
65 -98
66 100
67 -84

List of values

[1, -2, 4, -4, 6, -8, 10, -9, 11, -14, 16, -14, 16, -20, 22, -19, 21, -26, 28, -24, 26, -32, 34, -29, 31, -38, 40, -34, 36, -44, 46, -39, 41, -50, 52, -44, 46, -56, 58, -49, 51, -62, 64, -54, 56, -68, 70, -59, 61, -74, 76, -64, 66, -80, 82, -69, 71, -86, 88, -74, 76, -92, 94, -79, 81, -98, 100, -84]

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