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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.

A071907 Kolakoski-(1,4) sequence: a(n) is length of n-th run.

Table of values

n a(n)
1 1
2 4
3 4
4 4
5 4
6 1
7 1
8 1
9 1
10 4
11 4
12 4
13 4
14 1
15 1
16 1
17 1
18 4
19 1
20 4
21 1
22 4
23 4
24 4
25 4
26 1
27 1
28 1
29 1
30 4
31 4
32 4
33 4
34 1
35 1
36 1
37 1
38 4
39 1
40 4
41 1
42 4
43 4
44 4
45 4
46 1
47 4
48 4
49 4
50 4
51 1
52 4
53 4
54 4
55 4
56 1
57 1
58 1
59 1
60 4
61 4
62 4
63 4
64 1
65 1
66 1
67 1
68 4
69 1
70 4
71 1
72 4
73 4
74 4
75 4
76 1
77 1
78 1
79 1
80 4
81 4
82 4
83 4
84 1
85 1
86 1
87 1
88 4
89 1
90 4
91 1
92 4
93 4
94 4
95 4
96 1
97 4
98 4
99 4
100 4
101 1
102 4
103 4
104 4
105 4

List of values

[1, 4, 4, 4, 4, 1, 1, 1, 1, 4, 4, 4, 4, 1, 1, 1, 1, 4, 1, 4, 1, 4, 4, 4, 4, 1, 1, 1, 1, 4, 4, 4, 4, 1, 1, 1, 1, 4, 1, 4, 1, 4, 4, 4, 4, 1, 4, 4, 4, 4, 1, 4, 4, 4, 4, 1, 1, 1, 1, 4, 4, 4, 4, 1, 1, 1, 1, 4, 1, 4, 1, 4, 4, 4, 4, 1, 1, 1, 1, 4, 4, 4, 4, 1, 1, 1, 1, 4, 1, 4, 1, 4, 4, 4, 4, 1, 4, 4, 4, 4, 1, 4, 4, 4, 4]