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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.

A155124 Triangle T(n, k) = 1-n if k=0 else 2, read by rows.

Table of values

n a(n)
0 1
1 0
2 2
3 -1
4 2
5 2
6 -2
7 2
8 2
9 2
10 -3
11 2
12 2
13 2
14 2
15 -4
16 2
17 2
18 2
19 2
20 2
21 -5
22 2
23 2
24 2
25 2
26 2
27 2
28 -6
29 2
30 2
31 2
32 2
33 2
34 2
35 2
36 -7
37 2
38 2
39 2
40 2
41 2
42 2
43 2
44 2
45 -8
46 2
47 2
48 2
49 2
50 2
51 2
52 2
53 2
54 2
55 -9
56 2
57 2
58 2
59 2
60 2
61 2
62 2
63 2
64 2
65 2
66 -10
67 2
68 2
69 2
70 2
71 2
72 2
73 2
74 2
75 2
76 2
77 2
78 -11
79 2
80 2
81 2
82 2
83 2
84 2
85 2
86 2
87 2
88 2
89 2
90 2

List of values

[1, 0, 2, -1, 2, 2, -2, 2, 2, 2, -3, 2, 2, 2, 2, -4, 2, 2, 2, 2, 2, -5, 2, 2, 2, 2, 2, 2, -6, 2, 2, 2, 2, 2, 2, 2, -7, 2, 2, 2, 2, 2, 2, 2, 2, -8, 2, 2, 2, 2, 2, 2, 2, 2, 2, -9, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, -10, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, -11, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2]

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