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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.

A147657 a(1)=1, a(2)=2, thereafter (1, -2, 3, -4, 5, -6, ...) interleaved with (-2, 2, -2, 2, ...).

Table of values

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

List of values

[1, 2, 1, -2, -2, 2, 3, -2, -4, 2, 5, -2, -6, 2, 7, -2, -8, 2, 9, -2, -10, 2, 11, -2, -12, 2, 13, -2, -14, 2, 15, -2, -16, 2, 17, -2, -18, 2, 19, -2, -20, 2, 21, -2, -22, 2, 23, -2, -24, 2, 25, -2, -26, 2, 27, -2, -28, 2, 29, -2, -30, 2, 31, -2, -32, 2, 33]

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