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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.

A131389 Sequence (d(n)) generated by Rule 1 (see Comments) with a(1) = 1 and d(1) = 0.

Table of values

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

List of values

[0, 1, 2, -1, 3, 4, -2, -3, 6, -4, 5, 7, -5, 8, -6, -7, 9, 10, -8, 11, -10, 12, -9, -11, 13, 14, -13, -12, 15, 16, -14, -15, 17, 18, -16, 19, -17, 20, -19, 21, -18, 22, -20, -21, 24, -22, 23, 25, -23, 26, -25, 27, -24, 28, -26, -27, 30, 29, -31, 32, -28, 31, -29, 33, -30, 34, -32, -33, 35, 36, -34]

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