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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.

A105811 Expansion of g.f. (1+x-x^2)/(1+x)^2.

Table of values

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

List of values

[1, -1, 0, 1, -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]

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