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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.

A376637 The word 1 belongs to the sequence, and whenever a word w belongs to the sequence, then the words consisting of 1's and 2's whose run lengths transform equals w also belong to the sequence.

Table of values

n a(n)
1 1
2 2
3 11
4 12
5 21
6 22
7 112
8 122
9 211
10 221
11 1121
12 1122
13 1211
14 2122
15 2211
16 2212
17 11221
18 12112
19 12211
20 12212
21 21121
22 21122
23 21221
24 22112
25 112212
26 121122
27 212211
28 221121
29 1121122
30 1121221
31 1122122
32 1211221
33 1221121
34 1221211
35 2112122
36 2112212
37 2122112
38 2211211

List of values

[1, 2, 11, 12, 21, 22, 112, 122, 211, 221, 1121, 1122, 1211, 2122, 2211, 2212, 11221, 12112, 12211, 12212, 21121, 21122, 21221, 22112, 112212, 121122, 212211, 221121, 1121122, 1121221, 1122122, 1211221, 1221121, 1221211, 2112122, 2112212, 2122112, 2211211]

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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