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 | 1 |
| 2 | 11 |
| 3 | 21 |
| 4 | 111 |
| 5 | 121 |
| 6 | 211 |
| 7 | 221 |
| 8 | 321 |
| 9 | 1111 |
| 10 | 1121 |
| 11 | 1211 |
| 12 | 1221 |
| 13 | 1321 |
| 14 | 2111 |
| 15 | 2121 |
| 16 | 2211 |
| 17 | 2221 |
| 18 | 2321 |
| 19 | 3211 |
| 20 | 3221 |
| 21 | 3321 |
| 22 | 4321 |
| 23 | 11111 |
| 24 | 11121 |
| 25 | 11211 |
| 26 | 11221 |
| 27 | 11321 |
| 28 | 12111 |
| 29 | 12121 |
| 30 | 12211 |
| 31 | 12221 |
| 32 | 12321 |
| 33 | 13211 |
| 34 | 13221 |
| 35 | 13321 |
| 36 | 14321 |
| 37 | 21111 |
| 38 | 21121 |
| 39 | 21211 |