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 | 4 |
| 2 | 646 |
| 3 | 2772 |
| 4 | 5445 |
| 5 | 8778 |
| 6 | 30303 |
| 7 | 48384 |
| 8 | 50505 |
| 9 | 54145 |
| 10 | 63336 |
| 11 | 77077 |
| 12 | 117711 |
| 13 | 219912 |
| 14 | 234432 |
| 15 | 239932 |
| 16 | 255552 |
| 17 | 272272 |
| 18 | 294492 |
| 19 | 535535 |
| 20 | 585585 |
| 21 | 636636 |
| 22 | 717717 |
| 23 | 825528 |
| 24 | 888888 |
| 25 | 951159 |
| 26 | 999999 |
| 27 | 1103011 |
| 28 | 1112111 |
| 29 | 1345431 |
| 30 | 2248422 |
| 31 | 2267622 |