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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.

A145917 Triangle read by rows: to get n-th row, start with -4n and successively add 5, 7, 9, 11, 13, ... until reaching a square.

Table of values

n a(n)
0 0
1 -4
2 1
3 -8
4 -3
5 4
6 -12
7 -7
8 0
9 9
10 -16
11 -11
12 -4
13 5
14 16
15 -20
16 -15
17 -8
18 1
19 12
20 25
21 -24
22 -19
23 -12
24 -3
25 8
26 21
27 36
28 -28
29 -23
30 -16
31 -7
32 4
33 17
34 32
35 49
36 -32
37 -27
38 -20
39 -11
40 0
41 13
42 28
43 45
44 64
45 -36
46 -31
47 -24
48 -15
49 -4
50 9
51 24
52 41
53 60
54 81
55 -40
56 -35
57 -28
58 -19
59 -8
60 5
61 20
62 37
63 56
64 77
65 100

List of values

[0, -4, 1, -8, -3, 4, -12, -7, 0, 9, -16, -11, -4, 5, 16, -20, -15, -8, 1, 12, 25, -24, -19, -12, -3, 8, 21, 36, -28, -23, -16, -7, 4, 17, 32, 49, -32, -27, -20, -11, 0, 13, 28, 45, 64, -36, -31, -24, -15, -4, 9, 24, 41, 60, 81, -40, -35, -28, -19, -8, 5, 20, 37, 56, 77, 100]

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