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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.

A099570 Expansion of ((1+x)^2 - x^3)/(1+x)^2.

Table of values

n a(n)
0 1
1 0
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
68 66
69 -67
70 68
71 -69
72 70
73 -71
74 72
75 -73

List of values

[1, 0, 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, 66, -67, 68, -69, 70, -71, 72, -73]

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