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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.

A101492 Triangle read by rows: T(n,k) = (n-k+1)*(4*k+1).

Table of values

n a(n)
0 1
1 2
2 5
3 3
4 10
5 9
6 4
7 15
8 18
9 13
10 5
11 20
12 27
13 26
14 17
15 6
16 25
17 36
18 39
19 34
20 21
21 7
22 30
23 45
24 52
25 51
26 42
27 25
28 8
29 35
30 54
31 65
32 68
33 63
34 50
35 29
36 9
37 40
38 63
39 78
40 85
41 84
42 75
43 58
44 33
45 10
46 45
47 72
48 91
49 102
50 105
51 100
52 87
53 66
54 37
55 11
56 50
57 81
58 104
59 119
60 126
61 125
62 116
63 99
64 74
65 41
66 12
67 55
68 90
69 117

List of values

[1, 2, 5, 3, 10, 9, 4, 15, 18, 13, 5, 20, 27, 26, 17, 6, 25, 36, 39, 34, 21, 7, 30, 45, 52, 51, 42, 25, 8, 35, 54, 65, 68, 63, 50, 29, 9, 40, 63, 78, 85, 84, 75, 58, 33, 10, 45, 72, 91, 102, 105, 100, 87, 66, 37, 11, 50, 81, 104, 119, 126, 125, 116, 99, 74, 41, 12, 55, 90, 117]

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