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) |
|---|---|
| 1 | 12 |
| 2 | 21 |
| 3 | 112 |
| 4 | 121 |
| 5 | 122 |
| 6 | 211 |
| 7 | 212 |
| 8 | 221 |
| 9 | 1112 |
| 10 | 1121 |
| 11 | 1122 |
| 12 | 1211 |
| 13 | 1212 |
| 14 | 1221 |
| 15 | 1222 |
| 16 | 2111 |
| 17 | 2112 |
| 18 | 2121 |
| 19 | 2122 |
| 20 | 2211 |
| 21 | 2212 |
| 22 | 2221 |
| 23 | 11112 |
| 24 | 11121 |
| 25 | 11122 |
| 26 | 11211 |
| 27 | 11212 |
| 28 | 11221 |
| 29 | 11222 |
| 30 | 12111 |
| 31 | 12112 |
| 32 | 12121 |
| 33 | 12122 |
| 34 | 12211 |
| 35 | 12212 |
| 36 | 12221 |
| 37 | 12222 |
| 38 | 21111 |
| 39 | 21112 |
| 40 | 21121 |
| 41 | 21122 |
| 42 | 21211 |