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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.

A132898 Triangle read by rows: T(n,k) = (-1)^(n-1)*n + (-1)^(k-1)*k - 1, 1 <= k <= n.

Table of values

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

List of values

[1, -2, -5, 3, 0, 5, -4, -7, -2, -9, 5, 2, 7, 0, 9, -6, -9, -4, -11, -2, -13, 7, 4, 9, 2, 11, 0, 13, -8, -11, -6, -13, -4, -15, -2, -17, 9, 6, 11, 4, 13, 2, 15, 0, 17, -10, -13, -8, -15, -6, -17, -4, -19, -2, -21, 11, 8, 13, 6, 15, 4, 17, 2, 19, 0, 21]

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