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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.

A378282 Irregular triangular T: (row 1) = (1); (row n+1) = inverse runlength sequence of row n, starting with 2 if r = 3k for some k, and 1 otherwise. See Comments.

Table of values

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

List of values

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

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