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 | 1 |
| 1 | 1 |
| 2 | 2 |
| 3 | 6 |
| 4 | 24 |
| 5 | 12 |
| 6 | 27 |
| 7 | 189 |
| 8 | 1125 |
| 9 | 1125 |
| 10 | 1125 |
| 11 | 12357 |
| 12 | 124488 |
| 13 | 1134468 |
| 14 | 12255588 |
| 15 | 12333888 |
| 16 | 12234789 |
| 17 | 11234799 |
| 18 | 22222368 |
| 19 | 222224499 |
| 20 | 444448899 |
| 21 | 2333467899 |
| 22 | 12333567789 |
| 23 | 12234567789 |
| 24 | 222336666999 |
| 25 | 1445555667789 |
| 26 | 12334444556778 |
| 27 | 33333336 |
| 28 | 33333489 |
| 29 | 111666789 |