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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.

A259829 a(n) = (-1)^floor(n/2) * A035185(n).

Table of values

n a(n)
1 1
2 -1
3 0
4 1
5 0
6 0
7 -2
8 1
9 1
10 0
11 0
12 0
13 0
14 -2
15 0
16 1
17 2
18 -1
19 0
20 0
21 0
22 0
23 -2
24 0
25 1
26 0
27 0
28 2
29 0
30 0
31 -2
32 1
33 0
34 -2
35 0
36 1
37 0
38 0
39 0
40 0
41 2
42 0
43 0
44 0
45 0
46 -2
47 -2
48 0
49 3
50 -1
51 0
52 0
53 0
54 0
55 0
56 2
57 0
58 0
59 0
60 0
61 0
62 -2
63 -2
64 1
65 0
66 0
67 0
68 2
69 0
70 0
71 -2
72 1
73 2
74 0
75 0
76 0
77 0
78 0
79 -2
80 0
81 1
82 -2

List of values

[1, -1, 0, 1, 0, 0, -2, 1, 1, 0, 0, 0, 0, -2, 0, 1, 2, -1, 0, 0, 0, 0, -2, 0, 1, 0, 0, 2, 0, 0, -2, 1, 0, -2, 0, 1, 0, 0, 0, 0, 2, 0, 0, 0, 0, -2, -2, 0, 3, -1, 0, 0, 0, 0, 0, 2, 0, 0, 0, 0, 0, -2, -2, 1, 0, 0, 0, 2, 0, 0, -2, 1, 2, 0, 0, 0, 0, 0, -2, 0, 1, -2]

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