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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.

A204028 Symmetric matrix based on f(i,j)=min(3i-2,3j-2), by antidiagonals.

Table of values

n a(n)
1 1
2 1
3 1
4 1
5 4
6 1
7 1
8 4
9 4
10 1
11 1
12 4
13 7
14 4
15 1
16 1
17 4
18 7
19 7
20 4
21 1
22 1
23 4
24 7
25 10
26 7
27 4
28 1
29 1
30 4
31 7
32 10
33 10
34 7
35 4
36 1
37 1
38 4
39 7
40 10
41 13
42 10
43 7
44 4
45 1
46 1
47 4
48 7
49 10
50 13
51 13
52 10
53 7
54 4
55 1
56 1
57 4
58 7
59 10
60 13
61 16
62 13
63 10
64 7
65 4
66 1
67 1
68 4
69 7
70 10
71 13
72 16
73 16
74 13
75 10
76 7
77 4
78 1
79 1
80 4
81 7
82 10
83 13
84 16
85 19
86 16

List of values

[1, 1, 1, 1, 4, 1, 1, 4, 4, 1, 1, 4, 7, 4, 1, 1, 4, 7, 7, 4, 1, 1, 4, 7, 10, 7, 4, 1, 1, 4, 7, 10, 10, 7, 4, 1, 1, 4, 7, 10, 13, 10, 7, 4, 1, 1, 4, 7, 10, 13, 13, 10, 7, 4, 1, 1, 4, 7, 10, 13, 16, 13, 10, 7, 4, 1, 1, 4, 7, 10, 13, 16, 16, 13, 10, 7, 4, 1, 1, 4, 7, 10, 13, 16, 19, 16]

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