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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.

A204022 Symmetric matrix based on f(i,j) = max(2i-1, 2j-1), by antidiagonals.

Table of values

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

List of values

[1, 3, 3, 5, 3, 5, 7, 5, 5, 7, 9, 7, 5, 7, 9, 11, 9, 7, 7, 9, 11, 13, 11, 9, 7, 9, 11, 13, 15, 13, 11, 9, 9, 11, 13, 15, 17, 15, 13, 11, 9, 11, 13, 15, 17, 19, 17, 15, 13, 11, 11, 13, 15, 17, 19, 21, 19, 17, 15, 13, 11, 13, 15, 17, 19, 21, 23, 21, 19, 17, 15, 13, 13, 15, 17, 19, 21, 23]

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