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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.

A280166 a(2*n) = 4*n if n>0, a(2*n + 1) = -(2*n + 1), a(0) = 1.

Table of values

n a(n)
0 1
1 -1
2 4
3 -3
4 8
5 -5
6 12
7 -7
8 16
9 -9
10 20
11 -11
12 24
13 -13
14 28
15 -15
16 32
17 -17
18 36
19 -19
20 40
21 -21
22 44
23 -23
24 48
25 -25
26 52
27 -27
28 56
29 -29
30 60
31 -31
32 64
33 -33
34 68
35 -35
36 72
37 -37
38 76
39 -39
40 80
41 -41
42 84
43 -43
44 88
45 -45
46 92
47 -47
48 96
49 -49
50 100
51 -51
52 104
53 -53
54 108
55 -55
56 112
57 -57
58 116

List of values

[1, -1, 4, -3, 8, -5, 12, -7, 16, -9, 20, -11, 24, -13, 28, -15, 32, -17, 36, -19, 40, -21, 44, -23, 48, -25, 52, -27, 56, -29, 60, -31, 64, -33, 68, -35, 72, -37, 76, -39, 80, -41, 84, -43, 88, -45, 92, -47, 96, -49, 100, -51, 104, -53, 108, -55, 112, -57, 116]

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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