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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.

A134237 Triangle read by rows, a(1) = 1, n-th row n terms of: (2n-1, 2n, 2n+1, ..., followed by n).

Table of values

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

List of values

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

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