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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.

A131738 a(0) = 0. a(n) = (n+1)*(-1)^n, n>0 .

Table of values

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

List of values

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

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