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.
| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 2 |
| 3 | 120 |
| 4 | 121 |
| 5 | 122 |
| 6 | 110 |
| 7 | 111 |
| 8 | 112 |
| 9 | 100 |
| 10 | 101 |
| 11 | 102 |
| 12 | 220 |
| 13 | 221 |
| 14 | 222 |
| 15 | 210 |
| 16 | 211 |
| 17 | 212 |
| 18 | 200 |
| 19 | 201 |
| 20 | 202 |
| 21 | 12020 |
| 22 | 12021 |
| 23 | 12022 |
| 24 | 12010 |
| 25 | 12011 |
| 26 | 12012 |
| 27 | 12000 |
| 28 | 12001 |
| 29 | 12002 |
| 30 | 12120 |
| 31 | 12121 |
| 32 | 12122 |
| 33 | 12110 |
| 34 | 12111 |
| 35 | 12112 |
| 36 | 12100 |
| 37 | 12101 |
| 38 | 12102 |
| 39 | 12220 |
| 40 | 12221 |
| 41 | 12222 |