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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.

A378303 Irregular triangular T: (row 1) = (1); (row n+1) = inverse runlength sequence of row n, starting with 1 if r = 3k for some k, and 2 otherwise. See Comments.

Table of values

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

List of values

[1, 2, 2, 2, 1, 1, 2, 2, 2, 1, 2, 2, 1, 1, 2, 2, 1, 2, 2, 1, 1, 2, 1, 1, 1, 2, 2, 1, 2, 2, 1, 1, 2, 1, 2, 2, 1, 2, 1, 2, 2, 1, 1, 2, 1, 1, 2, 2, 1, 2, 1, 1, 2, 1, 1, 2, 2, 1, 2, 2, 1, 2, 2, 1, 1, 2, 1, 2, 2, 1, 2, 1, 1, 2, 2, 1, 2, 2, 1, 2, 1, 1, 2, 1, 2, 2]

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