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 | 2 |
| 3 | 3 |
| 4 | 17 |
| 5 | 25 |
| 6 | 81 |
| 7 | 140 |
| 8 | 142 |
| 9 | 152 |
| 10 | 280 |
| 11 | 291 |
| 12 | 406 |
| 13 | 4209 |
| 14 | 4785 |
| 15 | 8474 |
| 16 | 9550 |
| 17 | 9596 |
| 18 | 21773 |
| 19 | 22352 |
| 20 | 24938 |
| 21 | 38428 |
| 22 | 48526 |
| 23 | 65426 |
| 24 | 75441 |
| 25 | 76705 |